diff --git a/index.html b/index.html
index 7e54a19..ab2d123 100644
--- a/index.html
+++ b/index.html
@@ -159,8 +159,6 @@
                         <section>
                           <h3>1 · 대상 교각</h3>
                           <div class="cp-tools">
-                            <label class="chk"><input id="cp-same-type" type="checkbox" checked />원본과 같은 형식만</label>
-                            <button id="cp-select-same" class="btn-o small" type="button">같은 형식 모두 선택</button>
                             <button id="cp-clear" class="btn-o small" type="button">선택 해제</button>
                           </div>
                           <div id="cp-targets" class="cp-chips"></div>
diff --git a/src/core/copy-targets.ts b/src/core/copy-targets.ts
index b73103b..25c8c3b 100644
--- a/src/core/copy-targets.ts
+++ b/src/core/copy-targets.ts
@@ -16,17 +16,16 @@ export interface TargetCandidate {
   selectable: boolean;
 }
 
-/** The piers offered as targets: every other pier, or only those of the source type. */
-export function copyCandidates(piers: CopyCandidate[], sourceName: string, sameTypeOnly: boolean): TargetCandidate[] {
-  const source = piers.find((p) => p.name === sourceName);
+/** The piers offered as targets: every other pier. The type is shown so a different type is visible. */
+export function copyCandidates(piers: CopyCandidate[], sourceName: string): TargetCandidate[] {
   return piers
-    .filter((p) => p.name !== sourceName && (!sameTypeOnly || p.type === source?.type))
+    .filter((p) => p.name !== sourceName)
     .map((p) => ({ name: p.name, type: p.type, selectable: p.hasModel }));
 }
 
 /** The targets that get the change: ticked by the user, selectable, and visible under the current filter. */
-export function selectedTargets(piers: CopyCandidate[], sourceName: string, sameTypeOnly: boolean, ticked: Set<string>): string[] {
-  return copyCandidates(piers, sourceName, sameTypeOnly)
+export function selectedTargets(piers: CopyCandidate[], sourceName: string, ticked: Set<string>): string[] {
+  return copyCandidates(piers, sourceName)
     .filter((c) => c.selectable && ticked.has(c.name))
     .map((c) => c.name);
 }
diff --git a/src/main.ts b/src/main.ts
index ec4dd41..3726670 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -640,7 +640,7 @@ function copyCandidateList(): CopyCandidate[] {
 function selectedCopyTargets(): Pier[] {
   const src = activePier();
   if (!src) return [];
-  const names = new Set(selectedTargets(copyCandidateList(), src.input.name, $<HTMLInputElement>('cp-same-type').checked, copySelection));
+  const names = new Set(selectedTargets(copyCandidateList(), src.input.name, copySelection));
   return state.piers.filter((p) => names.has(p.input.name));
 }
 
@@ -685,8 +685,7 @@ function renderCopyTargets(): void {
   const box = $('cp-targets');
   box.replaceChildren();
   const src = activePier();
-  const sameType = $<HTMLInputElement>('cp-same-type').checked;
-  for (const c of copyCandidates(copyCandidateList(), src?.input.name ?? '', sameType)) {
+  for (const c of copyCandidates(copyCandidateList(), src?.input.name ?? '')) {
     const label = el('label', undefined, 'chk');
     const check = el('input');
     check.type = 'checkbox';
@@ -698,7 +697,8 @@ function renderCopyTargets(): void {
       else copySelection.delete(c.name);
       renderCopyPreview();
     });
-    const text = c.selectable ? `${c.name} · ${c.type}` : `${c.name} · ${c.type} (모델 없음, 제외)`;
+    const otherType = src !== undefined && c.type !== src.input.type ? ' · 형식 다름' : '';
+    const text = c.selectable ? `${c.name} · ${c.type}${otherType}` : `${c.name} · ${c.type} (모델 없음, 제외)`;
     label.append(check, document.createTextNode(text));
     box.appendChild(label);
   }
@@ -3076,17 +3076,6 @@ $<HTMLButtonElement>('member-regen').addEventListener('click', () => {
   const pier = activePier();
   if (pier) regenerateOne(pier.input.name);
 });
-$<HTMLInputElement>('cp-same-type').addEventListener('change', () => {
-  renderCopyTargets();
-  renderCopyPreview();
-});
-$<HTMLButtonElement>('cp-select-same').addEventListener('click', () => {
-  const src = activePier();
-  const sameType = $<HTMLInputElement>('cp-same-type').checked;
-  copySelection = new Set(copyCandidates(copyCandidateList(), src?.input.name ?? '', sameType).filter((c) => c.selectable).map((c) => c.name));
-  renderCopyTargets();
-  renderCopyPreview();
-});
 $<HTMLButtonElement>('cp-items-reset').addEventListener('click', () => {
   const src = activePier();
   copyItemChoice = new Set(src ? copyItemsWithOverrides(src) : []);
diff --git a/tests/copy-targets.test.ts b/tests/copy-targets.test.ts
index 75d1279..6aeb8f9 100644
--- a/tests/copy-targets.test.ts
+++ b/tests/copy-targets.test.ts
@@ -12,32 +12,31 @@ const piers: CopyCandidate[] = [
 
 describe('copyCandidates (대상 후보)', () => {
   it('excludes the source pier', () => {
-    expect(copyCandidates(piers, 'P3', false).map((c) => c.name)).not.toContain('P3');
+    expect(copyCandidates(piers, 'P3').map((c) => c.name)).not.toContain('P3');
   });
 
-  it('keeps only the source type when 같은 형식만 is on', () => {
-    expect(copyCandidates(piers, 'P3', true).map((c) => c.name)).toEqual(['P1', 'P2', 'P5']);
+  it('offers piers of every type, so a different type is visible', () => {
+    expect(copyCandidates(piers, 'P3').map((c) => c.type)).toEqual(['T형', 'T형', 'Y형', 'T형']);
   });
 
   it('marks a pier without a model as not selectable', () => {
-    const p5 = copyCandidates(piers, 'P3', false).find((c) => c.name === 'P5');
+    const p5 = copyCandidates(piers, 'P3').find((c) => c.name === 'P5');
     expect(p5?.selectable).toBe(false);
   });
 });
 
 describe('selectedTargets (선택한 대상만)', () => {
   it('is empty when nothing is ticked', () => {
-    expect(selectedTargets(piers, 'P3', false, new Set())).toEqual([]);
+    expect(selectedTargets(piers, 'P3', new Set())).toEqual([]);
   });
 
   it('returns only ticked, selectable piers', () => {
     const picked = new Set(['P1', 'P4', 'P5']);
-    expect(selectedTargets(piers, 'P3', false, picked)).toEqual(['P1', 'P4']);
+    expect(selectedTargets(piers, 'P3', picked)).toEqual(['P1', 'P4']);
   });
 
-  it('ignores a tick on a pier hidden by the same-type filter', () => {
-    const picked = new Set(['P4']);
-    expect(selectedTargets(piers, 'P3', true, picked)).toEqual([]);
+  it('keeps a tick on a pier of another type', () => {
+    expect(selectedTargets(piers, 'P3', new Set(['P4']))).toEqual(['P4']);
   });
 });
 
@@ -82,7 +81,7 @@ describe('copyItemsWithOverrides (기준 교각에서 되돌리기가 표시된
   });
 
   it('selects the coping h1, h2 and Level 폭 items when those values changed', () => {
-    expect(copyItemsWithOverrides(source({ copingH1Mm: base.copingH1Mm + 1, levelWidthMm: base.levelWidthMm + 1 }))).toEqual(['coping-h1', 'level-width']);
+    expect(copyItemsWithOverrides(source({ copingH1Mm: (base.copingH1Mm ?? 0) + 1, levelWidthMm: (base.levelWidthMm ?? 0) + 1 }))).toEqual(['coping-h1', 'level-width']);
   });
 
   it('ignores a changed value that no copy item carries (groundEl)', () => {