Apart from the obvious differences like the ones you have mentioned then EXO PRO has the quick release clamp insted of the plastic clamp, the frame is Aluminium and lighter
Weight of Pro-Jump Exo Pro with knee bar per stilt: 3.6kg
Weight of Pro-Jump Exo Pro with calf cuff per stilt: 3.64kg
The EXO has a steel frame and is heavier and with knee bar per stilt comes in at about 4.15kg