If I recall correctly the European food regulations banned some acids that are allowed in the US and thus most soft drinks have different ingredients to them than in the US.
Also there is less sugar in it.
No idea how man different European versions there are.
Another deciding factor is the packaging the drinks come in.
PET loses carbonation over time, thus they put a lot more into it than they do to the same stuff bottled in glas.
I generally prefer the later.
Anyone of the US guys ever been to this store?