My Apple Account Balance has money from the old iTunes/App Store gift cards and from the new Apple Gift Card. The new Apple Gift card can be used for everything from Apple while the old iTunes/App Store Gift card can only be used on the App Store or iTunes. But but Apple Account Balance is made up of both! How does Apple know which part of my Apple Account Balance to use? Or I can now use the whole balance from my Apple Account Balance on Macs, iPhones etc?