[saiya-jin]

A food product is much more a sum of ingredients and procedure to process them, than just something something looking/tasting similar from given country. Especially those protected as historically significant to given place.

So no, what you buy as brie, if it went through official US import channels, is not real Brie. Now how much is the real difference in taste is another topic, but we take protecting traditional methods of making these things very seriously here in Europe. Very anti-race-to-the-bottom approach.