While there have been many claims from Canon that "this will break your printer", "you will go blind", etc., there do not appear to be any regional differences in Firmware versions. There certainly aren't any documented cases of problems on the Wiki from installing a firmware version released in one region to a printer that is "designed" for another region. The difference appears to be when a particular region feels that a firmware or software version is "ready for release". How it could be ready in one region, but not in another is certainly beyond comprehension.
Bottom line: I doubt there would be any problem with installation, but use at your own risk.
--John