Just read the pages you linked:
New TKI 2 WC Features:
Machined Sus. Holder – Strengthened front lower suspension holder is wider and thicker giving you the ability to handle big jumps and hard surfaces.
Heavy Duty – Strengthened front shock tower features a thicker construction giving you the ability to handle what ever your local track can dish out.
Redesigned Arms – Redesigned and reinforced for extra strength around the stabilizer mounting holes on the front lower suspension arms.
Increase Strength – Reinforcing ribs on the ball end sections of the rear upper suspension arms dramatically increase strength and rigidity to handle hard contact.
Move Up – The receiver battery is now positioned further forward to improve jumping control and cornering.
Rear Shock Stay – The rear shock tower is reinforced in the same way as the front and now featuring 10 upper arm mounting holes for a more precision set up.