Suppose that I have a box of Pathfinder Adventure Card Game: Mummy's Mask with adventure packs 1-6. I've already played through Mummy's Mask but I'd like to play more Pathfinder Adventure Card Game.
I've noticed that "Pathfinder Society Adventure Card Guild" has what looks like an alternate adventure path, Season of Factions' Favor. There seems to be a lot of alternate rules around this -- everyone has to buy a class deck and get upgrades from their class deck instead of the box. I don't need these rules, because I just want to play the game with my friends, and I'm happy to get upgrades directly from the box. (Also, I'd rather avoid spending $80 on class decks if that's not necessary.)
If I play through Season of Factions' Favor using standard Mummy's Mask characters (not Class Decks), will everything work properly? Will it be easier or harder than using Class Decks? Is there anything I should watch out for?