Another problem , besides the cross-contamination, is that boas and pythons have different temperature and humidity requirements.
Also, if the boa was ever exposed to any others that have had IBD, and it does develop fully, then chances are that the pythons will die quickly.
Many breeders use, or used to use, BPs as their test for the prescence of IBD in the boas as the BP would quickly die in the event that the boas carried it.
You have two snakes that are from different parts of the world that have different care needs.
Not to mention, if any of the breeders were feeding live or prekilled, the chances of parasitic contamination is greatly increased in the collection.
Way too many probs with them living together.
If you can't afford to house and care for them properly, perhaps another hobby would be best for you.