diff --git a/cmd/argocd/commands/app.go b/cmd/argocd/commands/app.go
index 9f7c34ecf3fad..1079bbaa96176 100644
--- a/cmd/argocd/commands/app.go
+++ b/cmd/argocd/commands/app.go
@@ -1034,7 +1034,7 @@ func findandPrintDiff(ctx context.Context, app *argoappv1.Application, resources
 			unstructureds = append(unstructureds, obj)
 		}
 		groupedObjs := groupObjsByKey(unstructureds, liveObjs, app.Spec.Destination.Namespace)
-		items = groupObjsForDiff(resources, groupedObjs, items, argoSettings, app.Name)
+		items = groupObjsForDiff(resources, groupedObjs, items, argoSettings, app.InstanceName(argoSettings.ControllerNamespace))
 	} else if diffOptions.serversideRes != nil {
 		var unstructureds []*unstructured.Unstructured
 		for _, mfst := range diffOptions.serversideRes.Manifests {
@@ -1043,7 +1043,7 @@ func findandPrintDiff(ctx context.Context, app *argoappv1.Application, resources
 			unstructureds = append(unstructureds, obj)
 		}
 		groupedObjs := groupObjsByKey(unstructureds, liveObjs, app.Spec.Destination.Namespace)
-		items = groupObjsForDiff(resources, groupedObjs, items, argoSettings, app.Name)
+		items = groupObjsForDiff(resources, groupedObjs, items, argoSettings, app.InstanceName(argoSettings.ControllerNamespace))
 	} else {
 		for i := range resources.Items {
 			res := resources.Items[i]