Open up notepad and copy/paste your stuff over?
There shouldn't be that much you'd really want to copy over anyways, other than genre, title and maybe box text if its the same language. Box art, images, barcodes, item number, rating, and (traditionally) release dates will always be different from one region to the next. In some cases even the title is different names. If there was a tool for duplicating I hope only admins would have it because I just know some folks will go crazy (like myself, lol) and convert all kinds of stuff from NA to EU without thinking and create a mess of inaccuracies.