<p>Well, Crisis in Infinite Earths consolidated the parallel worlds, whereas Zero Hour did that with alternate timelines. Most temporal anomalies were erased from existence, although people still remembered them. Some aspects of history were altered to better fit the current continuity. As for LOSH, it changed then simislrly to how NE changed characters in the shift to PE. There was the LOSH before ZH (ergo, pre-ZH), LOSH after ZH (post-ZH), and later that version of the team was replaced when the timeline shifted again and created the Earth-Prime LOSH team.</p>