You are absolutely right. The grand solo played (refer to the famous documentary) by Julian Bream has a slight variation in few of the bars from all the original scores that you can find. Not written any where but only can hear from Julian Bream. I love Julian Bream's version very much. After so much searching, I finally gave up and just duplicated those differences that Julian Bream had made over the original score. Not a lot actually, just need to listen very carefully and write them down. However, those changes really spice up the taste of that great work by Sor.
Without heart and desire, talent is nothing.