Physicalism claims rebirth is impossible, show rebirth happens, physicalism is wrong.
Rebirth and reincarnation looks the same from the external point of view.
It’s philosophy that differentiates them. Reincarnation assumes a soul, rebirth is based on no soil/no self and the complicated dependent origination to describe the whole process.
From the kids who remembered past lives it is clear that they regard their past lives as themselves as well. Consistent with the perspective of unenlightened people.
The six sense field of contact is the all, and it includes heaven and hell. We don’t see a random planet across the universe somewhere out there because we are not in the condition to see it. For those who have divine eye, they can see heaven and hell, for those reborn into it, they can certainly sense those realms as well.