It is a pretty simple comparison, the TA package isn't that big.
SRT Track Package vs Time Attack Package:
TP = StopTech 2-piece brake rotors, lightweight wheels, Pirelli Corsa tires.
TA = Same TP wheels/tires, plus larger diameter and thicker front brake rotors. Exterior carbon group (brake cooling ducts front and rear, rear tail panel). Aero carbon group (front splitters, rear spoiler). Carbon engine bay X-brace. Contrast color-stitching on interior surfaces and seats. Decals in lieu of hard emblems. 2-mode electric shocks.
The only negatives for the TA is that you can only get the ballistic cloth seats, only matte black wheels, and only in specific colors. The TA cars won't have any options, it is a set package. So, likely no available NAV, stereo upgrads, leather, rear-cam, etc... But, that is also what makes the TA cool. Pretty raw car. The orange is likely to be only for TA cars. Most of the $10K cost difference is the overpriced carbon fiber bits, and the shock system.