Howdy and thanks for the reply! It sort of answers my question, but I may not have asked the original question as concisely as I could. Let me give an example and see if it makes more sense.
We play Lords of Winterdeep together. I bought the full version and all IAP unlocks (Undermountain and Skullport) under my Apple ID. I was able to download and restore everything on her iPad. The same is true for Ascension, Carcassonne, Talisman and PuzzleStrike. Mind you she is still using her Game Center (Apple ID) but all purchases on her device are via my App Store account.
I understand that consumable IAP are one shot deals, in the case of your game, buying gold for example, but the $25 Season Pass bundle seems as though it should work the same as most board games. Hope that clears my question up and appreciate your reply!