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Actually, White Forests' data is in Black, and vice versa. All it is, is different pointers to data. You can test this by swapping saves between the two. It'll be rather glitchy, though.
This is just logical. If you link with a Black game in the Global Link and you own White and then do a mission, you can visit Black city. This isn't a glitch (except the glitch forest) because both places are in both games. Also, cross-over your sav works because BOTH THE GAMES HAVE THE SAME BASE. GF starts with making one game, and then they copy it and slightly edit the copy to get 2 different games. This isn't weird or anything, if you put a HG sav on a SS game you can catch Lugia the SS way. That's how it is done.
Hmmm... camera position and camera angle... interesting. I will do some research in map_matrix, because I don't know if the header is stored in land_data_release.narc
Also, does map music changing need to edit the sound_data.sdat? Because that's not good if you want to swap two map songs...