Whoa. When I first saw the pics, I thought, "Oh wow, are they actually going to cast these guys in some kind of TV series or movie?" But then I read what's going on haha. That'd be weird.
Seriously, though - if I had to choose who's voice goes with who, it should be Cody = Frank and Jesse = Joe just in my opinion, from what I can remember what they sound like! It seems kind of backwards, but whatever.