I can tell you teh differene from a statci point of view, as Im finishing one.

The ARF is a lot lighter. The composite used on the flying surfaces is typical of C-ARF brand. It seems to beup of very thin layers of F/G cloth, rather than the heavier typically used for the fuselage. There is no brake on the ARF Bandit, and to be honest why would it be needed anyways. Flaps are just as huge as on the kit Bandit.
The main landing gear has no inner doors for simplicity.

All this considered, the ARF shoudl fly as good as the kit, except you'll need a much smaller engine.