It'll be harder to cross python regius with morelia viridis than it is morelia viridis x morelia sp., or python regius x python sp., simply because they're not as closely related, so there will be far fewer genes in common. The result will be a lot more non-viable eggs. And the final hybrid is even more likely to be a mule, i.e. sterile.

But if carpets and balls have been successfully mixed, and womas and balls, you should be able to cross balls and chondros. In theory. Maybe.