Thread:Tupka217/@comment-3567304-20130909204739/@comment-1038387-20130915151325

Earth-One and Earth-Two Superman have had hundreds of appearances pre-Crisis. Earth-Two Superman has later appearances too, so that's not really a good example; they're explicitly stated to be different characters.

Lobo had three years of Pre-Crisis appearances, mostly as a supporting character to a group who survived the Crisis pretty much intact.

An elaboration on and even change in the origin is normal if a supporting character gets elevated to a lead character in his own series. Often, people just get updated origins if the story or the time calls for it, and it doesn't have to be tied to a specific event like the Crisis or Zero Hour (think Huntress in Cry for Blood and Atom and Max Lord in Brightest Day). It doesn't make the version that appeared before that a different character. It's the same character with some changes.