Chaps,
In terms of full size............
Model 12 - 2 seat standard Model 12 HP about 1600lbs AUW
Python/Ti12 - Single seat (obviously different canopy), front seat set up and controls deleted, larger span ailerons and tail group surfaces, different U/C, prop/motor and about 200lbs lighter than the standard Model 12HP. More use of carbon fiber.
A few other smaller differences not too appliacble to RC models.
Rob
www.aerobaticdisplays.co.uk