Migration Assistant & Admin Account

I did a clean install of Leopard on my G4 PB (I had cloned Tiger to an external drive). I brought up Migration Assistant with the external drive connected, followed the dialog choices, but I was confused by the option to bring the Administrative Account from Tiger into the Administrative Account of Leopard. I'm using the same name, which was brought out when I was taken through the steps. I wasn't given the option to replace--that was grayed out. So how do I handle that migration? Does the Administrative Account have to be migrated manually or is it done automatically (regardless of the name being different or the same)?