I have done the pathetique and I am now doing the Appassionata. I don't think you should do the Appassionata after doing the pathetique. The Appassionata is waaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaay more difficult, the first movement is technically awkward and it's extremely difficult to keep everything together, without letting it sound boring. You have to be able to play extremely soft and the moment after extremely loud without sounding ugly, the repeated notes are bitches and well, I think I made my point clear.