Well I hate to tell you, they are scamming players like you with the name “Overwatch 2”. Its is the “Battle Chest” version of Overwatch. Overwatch 2 is going to replace all future purchases of Overwatch 1. Meaning you wont be able to by just Overwatch 1 without having to get Overwatch 2 with it.
So with that being said… OVERWATCH 2 is the same game as Overwatch 1, just with PVE Content. You unlock the same exact items for both game by playing either. You play with OW1 and OW2 players in the same Servers for PVP. The only thing different is OW2 players only play with OW2 players in PVE, until an OW1 player upgrades.
The Anti-Cheat will be the same, the Penalty System will be the same for both games. They will update both games simultaneously with the same content and patches.
SAME GAME. THE END.