How to Conceptualize a Soul in a Timeline

If you were to save someone in the past, would that person have a different soul? They lived a longer lifetime and committed other acts, either righteous or sinful. To me, that would logically mean it's not the same soul since we are judged by our one life. But if timelines branch, souls branch, it's just a question of how do you conceptualize that? Do you want to conceptualize the soul as the whole thing with these different branches that then get judged or, you know, in sense to heaven or hell?