There really is no way to tell if a ball python is het. In your case, the pastel would be het for OG because a parent was an OG. When you have parents that are OG, Pied, Albino and you breed them to anything they will all be 100% het. If you breed two hets (such as two het pieds) together you get 66% probable hets because statistically 25% will be pied, 50% will be het for pied and 25% will be normal, so 2/3 (66%) of the normals will be hets. In the case where you breed a het to a non-het you get 50% probable hets. It's all statistics with hets.
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