I currently don't distinguish between part variations but am planning to begin to do so. I'm a glutton for punishment, obviously. Is anyone aware of a comprehensive list of such variations?
As an aside, it would be awesome if it were possible to choose which parts we distinguish variations of. For example, I would elect to distinguish between the three different 1 x 2 jumper plates, but not the rounded/square corner versions of brackets and panels.
Comments
Try making a little table for your minifigs using a 3062 Round brick and the round tile with O, then try the same with the tile with the old 'X' mold and you'll know why there is a functional difference ;-)