P3's aren't just software according to Tesla.
Its a longer motor burn-in. That's a physical thing.
It's not a physical
difference
It just means they left it running longer on the bench.
No seriously, there is also no proof that the motors have the same hardware
Except yes, there is. And has been for quite a long time.
The actual physical part in an AWD and a P (prior to early this year) is
the exact same part in the Tesla parts catalog
In early 2019 the AWD was changed to a
different part- so it's no longer the same.
We don't know the details of what is different (though it's pretty clear the new part is both cheaper, and less capable of handling P power).
But prior to that change we
know for a fact the parts were the same because Tesla explicitly tells you that via the parts catalog and owners having physically posted pics of their rear drive units in the other thread.
P3
There is clearly no proof that it's just a software difference
Except there is- and not just the above- but the numerous folks who showed up to buy a P3D-, got delivered an AWD, and had it changed into a P with just a software update... (all of these were AWD cars built with the "original" rear part number of course).