IMHO there is none really. They are fairly similar (Granted Veileds are more forgiving with higher temps and lower humidity).
I kept my Veiled like i did my Panthers ( not the other way around). Panthers like it a bit more humid, i kept all my Chams in the 40-60% Humidity range with extra mistings when in shed.
I have never had a Panther eat anything other than insects. You can solve this by gutloading your insects with fruits and veggies, they will act as a "bug-veggie pill"