So, other than the obvious language thing, is there any compatibility issues between the two versions?

Well, I´ve got the english and german Version, and beside the Rules there are no differences between them - also the charaktersheets are identical ^^

I think this is the same for the french version.

to be precise, I meant the rulebook and cheat-sheets - the written documents ^^

That totally kicks... err... mule!!!.... can i say mule on this board?