The best approach is to create a custom Joomla authentication plugin. On login attempt you'd check those credentials against your other site to make sure they're valid and they exist. If they're valid and they do exist then compare their profile data and last update date to see which profile is most up to date then synchronize the data as needed depending on which is most up to date. If the user doesn't exist on one of the sites you'd then just create them at this time or let CB do it.
Nicks approach also works by using CB Auto Actions on the after registration and after profile update triggers with a Query action. The query action can act on External databases so it's possible to use substitutions to substitute profile data into your query to the external site. The problem with this method is you need to maintain 3 tables at minimum (_comprofiler, _users, and _user_usergroup_map).
Kyle (Krileon)
Community Builder Team Member
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krileon
