There still is a ACC manager ingame, if in server config, accountmanger is "yes"
Yet with a site, the site admin account is the ACC manager. So When you changed the password, it changed it from 1/1 to the one you set. It will also be difficult to have both without the chance of a player logging into a site with the account manager and making characters on it and therefore there will be characters on the account manager ingame and that wouldn't be good...
Yet. If you mean account manager on each account, then just make sure in the server config, account manager is "yes"