You can't really guess hets with 100% accuracy. You would have to breed them together and see if any visual offspring appear.
However, by looking at the snakes themselves, I'll say that the first pictured snake can "possibly" be het for pied. It has the train track markers. But I've also seen normals with the tracks too. And the second doesn't have a clean belly.
Overall, all you can do is prove them out. Good luck.
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