It's definitely not a pastel enchi and we can't say if it's het or not, you'd have to breed it with a ultramel to find out.
It looks like it could have enchi and possibly pastel but it definitely has something else to give it that color because it's way off for just enchi pastel. My guess would be it has lesser/butter to get that color but I'm not sure what else. It's very pretty though.
Thank you very much, here is a different photo of him in lower light one the breeder sent me originally
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