Version Switch ?

[electro]

Since I've gotten 3 pumpkins on all levels now, I'd really like to have a crack at that bonus mission. But of course, I've got the US version of the game.

I know there's a way to change the version, but I'm wondering if that has any sort of downside. And especially, will I be unable to play my current (US) save game if I do so?

[Nemesis]

I don't know for sure, but it's indeed highly likely that you won't be able to play your savegames after you have "switched versions". As for the actual version switching, take a look here.