I agree with what everone else has suggested, i dont think that it is a good idea to house your snakes together. First off in the wild a rtb and bp dont even really live at all near eachother. South america vs. africa. In the wild ball pythons live in burrows of rodents or termite mounds. They live by themselves in the burrow. The only times that two bp's would "live together" would be during the breeding season when they mate. But besides that they are solitary snakes. And you said its cute how they inseparable but they dont really have a choice to be seperate since theyre in the same tank competing for a hot spot or a hide.
Just my 2 cents.