do NOT house any type of snakes together. they are solitary animals which means they SHOULD be kept alone. please dont even house the same species of snakes together or different species of snake together.
the housing and husbandry for each of these snakes is very different also.
Ball Pythons are a much more "forgiving" snake if you mess up their husbandry a little, GTP's are not. Gtp's require a constant higher humidity, balls do not. Gtp's prefer a vertical(up) cage, balls like smaller, cosy ground level cages. As mentioned, each snake carries its own personal parasites. They are harmless(but essential) to each individual snake, but could kill the other one.
Either snake can easily be kept safely, as a neonate or juvenile, in a small shoebox size container(actually preferred housing for GTP's) while you get the required housing. Even better, get the proper housing before you aquire the snake as this will aleviate possible stress and feeding problems.
www.repticzone.com << go to this site it will help you ALOT