Nihilism is the most boring of cultshttps://twitter.com/vakibs/status/940233592369811456 …
In which case you have different universes, since they don't interact beyond sharing a single state, so neither of the observers needs to worry about the idea (or could have evidence) that other observers and their universes exist.
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The universes might interact.
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The universe with respect to an observer is only the causal network that feeds back to him. All causal branches that cannot lead back are part of a different universe. Thus, we can be in a setup like the one you have in mind but it makes no difference.
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