I've never had a wagon but if I remember correctly from what I've read over the years, the front seats and door cards are swappable between sedan and wagon. Everything behind the front seats is different. There is a post somewhere here in this forum where one of the members swapped out rear door cards from a different model VW or Audi. With very minor trimming it looked like a factory install. I'll see if I can find that post.
This probably is something you don't really want to do, but if you run out of options...
This probably is something you don't really want to do, but if you run out of options...