One of the few things where bing ads is imo better than Google, you have an Ad ID so when you make changes and re upload the ads, it updates existing ads based on the Ad ID.
Google doesn’t do this, the only way I know is to make sure changes are made in the editor not uploaded from a sheet, then it will update existing ads. This has been a pain in my side for years, perhaps someone else has a solution for us, but I think it’s a limitation in the system.
EDIT:
Sorry I think I misread this. You want to create new ad entities with the pins changed to compare right? Then in this case you can make the change in a spreadsheet and upload through editor, editor should create new ads. If not, you can change part of the ads and add some kind of placeholder so it recognises these as new ads and then use find and replace on the placeholder to make the ads correct again.
Hope this makes sense, feel free to DM if you have any questions.