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I think the same, therefore I am I?
(lemmy.nz)
Some extra context for the curious: https://pdf.stafforini.com/parfit-1995-unimportance-identity.pdf
There would be two "yous" from a past perspective. From a future perspective, only the one that is you would be you.
It's the same as a multiverse view, where every decision makes a split. Every branch going forward is you, but only the branch you're on is you.
Who you are changes over time. Everything that happened in the past is still part of you, but only things that happen to you are you.