Note: The griffin is in the intro set, not the GoAC, but it has cards in the GoAC.
actually that’s Alpha Strike cards, these are MechWarrior cards.
The Beginner Box has no Alpha Strike cards. The GoAC box has Alpha Strike cards, and includes the Griffin.
Both boxes have MechWarrior cards; the BB has cards for the Wolverine, Griffin and some of the ‘Mechs from the GoAC. The GoAC has cards for all the ‘Mechs that it comes with, as well as the Griffin.
The cards are double sided. A different MechWarrior on each side. There are two different sets between boxes, you won't get any duplicate cards.