It looks like EB Noah in Africa has credit for "introducing" the animal. I think what may have happened is that a clutch with champagnes in it hatched in Ghana and at the time they were likely an unnamed new mutation. Different offspring were then most likely sold to breeders in America where they were named Champagne, and in Europe where they were named Puma. That is the best explanation I can come up with given the information I was able to find on the origins of the mutation.
Randy, do you have a link to a picture of the American Puma you described?