I moved some characters from one account to another without any problems. The first account was one I set up for my wife who NEVER one time used it so I took it over. That account has her name on it and the other my name. I moved some characters from the account that is in my name to the one that is in her name. Honestly though they are both my accounts, and she never touched them. I was a bit concerned when I first did it because even that being the case I was afraid I would get a ban because of the first name, but that didn't happen.

As long as the last name is the same, and the contact location is the same you should be good. I don't think they look at the billing information as I use a mixture of credit cards and time cards for my 3 accounts.