Horizon 6 Premium

Hi everyone, quick question.

If I just get Horizon 6 from Game Pass and buy the Premium Upgrade, would that work? Like, would I need to purchase the game as well ?

Big Horizon fan since the first one, and I feel like this is going to be the best one yet so I want to go all out on it, but want to know if I could save a bit by just buying the Premium bundle and getting the game from Game Pass.

Thanks for your help!