Using your Example 1 >
I put a spot on the nose of a portrait
Made 5 virtual copies of it
Made differing changes to each of the virtual copies
Clicked on the Original - Shift-clicked on the last virtual copie [selecting all with the original being the 'most selected']
I removed the spot on the original and it was removed on all the virtual copies without changing anything else on the copies.
Auto sync is automatic to all copies when I press Enter after the spot removal - manual Sync requites 2 more mouse clicks - One selecting Sync and the other Synchronize in the dialog box
