User blog comment:Hatebunny/The DCnU, and why we have not made new pages/@comment-1650317-20120630182228/@comment-954262-20120716035424

A timeline change means that all the same events happen, but happen at different points. An alternate reality changes the very aspects of a character and their history. Which if you look at some of the New 52, that has been done. Wonder Woman being the prime example of that.