I was about to say yes because you can use the same Apple ID with iTunes and with the Mac App store. But then I noticed two different balances displayed in my Mac store versus iTunes store, though they are the same ID. Which is odd given that I've never bought from the Mac App store so I don't know where the $0.93 came from. So I'm guessing that I may have had some dollars loaded on iTunes before and then was given an iTunes card for Christmas which I redeemed. So perhaps the gift cards only go with iTunes?