Merging my edited deck and the upgraded deck from the original author

So I downloaded that amazing deck. I edit the cards here and there, and suddenly the author reupload the new version which is even more awesome than the old one.

How is it possible to apply my changes to the new deck, so that the merged result have both my changes and author’s changes? It looks like the deck’s text is an sqlite database, so i thought about sqlite diff tools, but maybe there’s already something specific for anki?

How would you recommend to go about editing somebody else’s deck and also benefit from the updates?