I've never heard anyone on this side of the pond call a Champagne a Puma... The only morph I know that have the same name is the Banana, but there is no way that you could confuse the European "Banana" to the other one.

I think the confusion comes from McCurlys book where the Champagne is one of the unproven morphs and is labeled as Puma on one of the pages.

Just my 2 cents! Nice looking snakes you have by the way...