Definitely not. GTPs require a much more humid environment which would probably lead to scale rot for your Ball Python. Balls live in a more arid climate and will undoubtedly have problems.
Also, GTPs tend to be very active at night while in feeding mode. Mine will strike as soon as I enter the room and will strike at the any movement when I go to feed. Imagine your Ball Python moving around when your GTP is in feeding mode.
Keep them separate.
Completely agree, keep those species separate and give them both their own ideal environments. A 6 foot cage in any sense for a ball python is too large.
6.5.15 Animals
1.2 Pomeranian's
0.1.15 Tropical Fish 2.2 Snakes:
0.1 2009 100% Het Piebald
0.1 Normal
1.0 Green Tree Python
1.0 Brazilian Rainbow Boa