Differences between Site Collection Administrator assigned through Central Admin and Site Settings

All this while I thought it doesn't matter how you assign a Site Collection Administrator (SCA) . FYI, we can assign a site collection either through Central Admin or Site Settings.

This articles describes the differences.

http://social.technet.microsoft.com/wiki/contents/articles/15270.site-collection-administrators-defined-from-central-administration-and-from-site-collection-top-level-site.aspx