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There is a difference between alternate timelines and parallel universes, at least as far as DC-Comics is concerned (and I ignore the effects and the diverse reboots of the Crisis):
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The parallel universes existed from the beginning of the Big Bang as separate entities with their own complete space-time continuum, even if they had identical or mostly identical histories up to a point. There is no real divergent point where the timelines split ala Everetts Quantum Multiverse involved.
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The universes of Earth 1, 2, 3 always existed on their own.
I don't think I'd agree with that. As in evolution, their similarities argue common ancestry.