Move imported duplicate cards

For context, both my friend and I have downloaded the AnKing deck. When going through lectures, I’ve been moving cards out into my own sorted decks for easier study.

If I export this deck to him, the cards will come up as duplicate and are ignored (or updated if I’ve made any changes).

Is there any way for him to import these duplicate cards in their own decks, or somehow move them?

I’ve tried experimenting with changing card type, adding special fields to cards, and importing as text file, all to no avail.

Any advice is greatly appreciated.

Couldn’t you tag them (which would mark the notes as updated)? That should ensure they import, and would allow your friend to find them.