These are always tough. I always lean on the safe side when selling animal. If a buyer ends up with an extra gene they will love you forever but if they end up not having a gene they paid for they will tell everyone that will listen. With all that said I understand your dilemma. Although I don't have a lot of experience with champagne combos I don't see enough to make me say for certain the pastel gene is present but it very well could be. Good luck. Beautiful snake either way.