Would like help with a mixup(Xbox)

You would have had to refund them at the time of purchase and repurchase the correct versions. Since it's been well over the timeframe for a refund and the 360 store is shut down, that would no longer be possible.

as the 360 store is closed there is no way to assign rights to any 360 content. I'm afraid you're far too late for a refund.

I know this is no longer possible, this is why I am asking for the content to be manually transferred to my Xbox 360 account. Your profile is connected from the 360 line all the way to Series X/S, it can't be hard to simple add this content manually from behind the scenes. If I could have done this manually, I would, but I am just finding out I bought the wrong version of the DLC now.

You can still download old content that is on your account, say other games I got for free from "Games for Gold" program. The content is still technically there on the servers, it's just that the store is closed down so you cannot buy new content. All I would need is someone within Microsoft to transfer said content on my account(without purchase, as I have done that already) and I could easily download the content. I am asking here since this is probably a unique situation that requires a unique solution.

To elaborate

The store is shut down

It can no longer assign rights to anything, regardless of reasons or conditions.

Which is what would be required.

Refunds and exchanges are required to be done within two weeks of purchase or two hours of play.