These both look pretty decent
from what I can see, but the video is pretty limiting.
Photos of them both straight on would be a much better indicator in this case.
Uniformly shifts tint on both models which is a relief.. instead of a green blob at the bottom.
Personally I wouldn't get
too hung up on Samsung or LG specifically, there are definitely bad Samsung out there and good LG a well. It's truly a lottery in all directions.
That said, I prefer a good Samsung over a good LG but I don't work at the assembly line

I've gotten on fine with my LG 13 mini that doesn't have green tint and you very well could be abandoning a good LG for an atrocious Samsung for example. From what I see very briefly at the straight on portion of the video, Pro looks cleaner and less tint biased.. I think?
If you really wanna know which is which just for science, run the diagnostics in OP and report back.
My bet is the PM is Samsung and Pro is LG: PM has a red bias looks like which is typical of Samsung and Pro has a dimmer off axis brightness which is typical of LG.
But also, perhaps more importantly, I would pick the phone you want and then look for a good one if you aren't happy rather than letting which display you got dictate which model you get. In the end, you'll be happier. Unless you're truly indifferent to Pro or Pro Max.
What are your initial thoughts?