I had a leg made for riding - left below knee amp.
The main diff was it was slightly shorter, and cut lower at the back and the foot was angled with the heel slightly down. It did help initially, butwasn't very good for walking on and getting my mare ready.
I now ride in my normal leg but have an adjustable heel, I release the lock when I ride which allows for some flexibility and absorbs some of the movement. Though I don't think i'm supposed to as it then leaks hydraulic fluid - oops but needs must.
I do dressage so focus on the length of my legs being balanced around my knees, so do tend to ride with my left stirrup a hole longer.
If you do alot of jumping I would try to get your leg lower cut at the back to allow you to ride with shorter stirrups. But don't go too low as when it gets hot the suction legs can slip and you use stability.
Good luck if i can let you know anything else just shout.