Yes, but 3.0 to 3.5 had some notable rules changes (Pathfinder even more so). The rules of 4e didn't change for Essentials, it was just a different philosophy for how to use those rules to create new versions of classes.
I mean ... really, it's all just been a different philosophy for how to use the rules to make new classes since the LBBs of OD&D.
So, you know, game, set, match ....
ALL UR EDITIONS R BELONG TO OD&D.