Yes, as long as they have a card that the box is unchecked, they can access the ride. There's nothing on the passes that indicates who the pass belongs to. We had 3 QQ passes from the hotel, and a friend got off work early and joined us. We switched around cards as needed so that 3 would ride and 1 would stay behind to hold stuff (usually my brother as he's not really a coaster person) and it was never an issue. As a former ride op at Manta, I can also tell you that I would never have known who's pass you were handing me - the only thing that mattered was if the box was checked or not. Now, with unlimited, it does matter, because you get a wristband you have to wear, but you'd have to purchase that separately.