While I know it won't be the same but I'd say it could be similar to how the Isekai works in "Mondaiji-tachi ga Isekai". The Parallel World Interaction Theory. In it 3 people are summoned at the same time but from similar yet still Parallel Worlds from different Era's. One was from just after WW2 ended, another from 201X and the third from a Distant Future. There is one character in a flashback from the 201X Characters backstory who's an MC in the Sequel that shows how complex Time can be when you learn of where she's been in the story.
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