Starfinder Rules Set?
Not really either... I'm not super well versed in pf2, but It's kinda 1.5ish maybe? there are a lot of interesting things I think are probably unique to starfinder in it.
The foundation of the game is 1E although there are a number of changes, such as the way full attacks work. From what I saw of 2E they really went in a completely different direction. If you are familiar with PF1 you can pick up 98% of SF very quickly; the last 2% is a bunch of tiny changes you won't realize were in the game until you have been playing for months.
