I have moved to Japan since having started my account in the US, and SQEX couldn't change my account to be a JP account.

I know that at least the Game Time cards are region-specific (the amount of dashes/characters/digits is different on each region), but will the Expansion code also be region-specific?

That is, if I want the CE, will I have to import a boxed copy from the US, or can I just safely and quickly get a Japanese CE?