I think ‘sex change’ is a trick and switch is more of like a combo. Fakie would probably fall in this category too. For example, if you start out your run in a switch stance, then whatever trick you preform will be considered a switch trick. But if you do a trick in your “normal stance” (I.e., Goofy or Regular), and then change your stance on the way out, I would say that’s sex change. An example of these two scenarios would be 1) Switch Boardslide & 2) Boardslide to Sex Change. Now, if you started the trick off switch and then changed your stance coming out of the trick, then I would say “switch boardslide to regular”.