As others have said, it's a bad idea to house two snakes of even the same species together but housing different species together is a huge no no. You are just asking for a world of problems if you keep them together.
Courtesy of a goggle image search (notice that the two snakes are similar in size, the boa actually regulated the ball python because the meal was too big):
You need to think about what's best for the animals not what's most convenient for you and please separate your ball pythons. They hate being house together and if you really do have a male and a female of those sizes then you could end up with eggs you aren't prepared for.
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