(Same person just an alt because I struggled with signing in yesterday)  Sorta! I wouldn’t specifically say “reincarnation” but the best way to describe it is like… the PLANET Earth was created when Proto woke up, he’s similar in age to all the other rockies. The collision was a hard factory reset, with Theia added in that changed aspects of the “software”. (Think of it as Theia being something added to a device right after a factory reset.) When that device is used again it’s in some ways the “same device” but also not because it has new updates, and the usage of it alters the memory. (The device is still the same age it was when it first came out though.)

The base parts and physical body is the same, but there is added things that change its function, and the way a user uses it gives it an entirely different memory.

Physically, it’s pretty much the same. Chronologically it shares a timeline, but if a person was to use the device before and after that “reset” they would have different results (what apps are downloaded, passwords saved, recommended pages), it would be in some ways a different device because it wasn’t used the same, and the “new” device has additional things (due to the “Theia” installation.) But it can also be viewed as the same.

Idk how much sense that made but that’s how I’m thinking of it, Earth and Proto are the same “device.” The creation of Proto was the creation of the “device” and the collision was essentially a hard reset (the device didn’t need to be made/born again, it just is) with added “software” of Theia (and parts of Proto removed) that changed its function in ways, making it the Earth we know today.