Fancamps, Fanfests and Ticket Exchange for the World Cup 2014 in Brazil

I have 4 tickets for the semifinal match 30 in Vienna (Cat.3). I want to swap them with 4 semifinal tickets match 29 in Basel. I prefer the same category. Also possible: Swap the Vienna-semifinal with tickets for Germany-Poland (game 4) or Germany-Croatia (game 11), but then I'd like to get some fin...