Going back in time argument 1
Going back and forward in time argument If you could go back in time after you were born having two versions of you existing at the same time means that two of you ( two different bodies made of different matter, in a different place, with some what different structure and functioning, producing the same ixperiencitness) can exist at the same time.
Going back in time argument
You could see yourself at any time and with any perspective including being in a body doing exactly like you did then
you would experience differently because your brain was different or has a different structure and then functioning differently
Going into the future argument
Seeing your self in the future you do not experience your future self
Multiple versions of you at the same time from the future and the past all having the same ixperiencitness but different consciousnesses
This applies to the ideas that there can be many different versions of you now or at any time in the future or past there can be versions that are aware of these other versions and ones that are not aware of multiple versions at the same time.
Divergence of the consciousness at the moment timeframe transference