I've thought for a while that paradox snakes might be 'chimeras'. To get a chimera in mammals you need a set of fraternal twins (siblings with different sets of fraternal DNA), and one of them needs to absorb the other. The results can be variable, from a person or dog with two differently coloured eyes, or a male tri-coloured cat (which is a genetic impossibility unless it has 2 different sets of DNA). There was a story in the news a while back about a woman who was fighting for custody of her kids. They collected her DNA from a blood sample and compared her DNA to her children's to make sure that they were hers and she could legally have custody. It didn't match, but she was sure she was their mother. They investigated it further and discovered she was a chimera. Her ovaries belonged to a fraternal twin that she'd absorbed in the womb, so her children's DNA was inherited from the twin. Here's the story if you're interested: http://abcnews.go.com/Primetime/story?id=2315693 Now, I'm not sure if two different ball python morphs can be conceived in the same egg, or if they're always identical twins. That fact could make or break the theory.
There was a member on here who hatched out a spotnose and a powerball in the same egg earlier this season. Obviously these were the same sire, not sure if you were referring to having completely different sires or just different siblings.