I always thought they were simliar. Maybe the equitation is just bases on you, and the medal is has both you and the horse judged in it more. Or maybe there was simply other people who had a better round?
I have developed a bad habit with my lower leg, I keep point my toes out, and using the back of my calf. I can 2 point like this and drop stirrups posting. In my lessons I am always told to put my toes forward as I am not putting on my inner thigh...