It depends on whose name Twickets consider to be the "lead attendee". With the tickets from G&T, the lead booker is the name on the order (e.g. the address it's sent too), so it can be different from the name on the credit card (ETA: In other words, if you're puchasing it for someone else, you just put their name on the order). But I've no idea if Twickets uses the same rule or not, you'd need to check.