The Player Core (1 and 2) are the remastered version while the Core Rulebook is the one before the OGL scandal happened.
As a refresher WotC wanted to abolish the open game license which allowed third parties to write and publish DnD compatible stuff while using terms and languages coined in DnD. Paizo used those as well and had to rephrase everything that would infringe WotCs IP. They also optimised pf2e a bit here and there.
So when you start new in pathfinder 2e, it would be best when you stick to the Core books (white spine): Player Core 1, Player Corel 2, GM Core, Monster Core.
The Player Core (1 and 2) are the remastered version while the Core Rulebook is the one before the OGL scandal happened.
As a refresher WotC wanted to abolish the open game license which allowed third parties to write and publish DnD compatible stuff while using terms and languages coined in DnD. Paizo used those as well and had to rephrase everything that would infringe WotCs IP. They also optimised pf2e a bit here and there.
So when you start new in pathfinder 2e, it would be best when you stick to the Core books (white spine): Player Core 1, Player Corel 2, GM Core, Monster Core.