paypal express/pro for "pro sites" plugin - is paypal "express" the same as &quo

i hope i am not being to picky with words, but in considering what type of paypal account to choose to apply to "pro sites", there is no mention of "express" on paypal site. there is "standard", "advance" and "pro"

is it simply a change of wording where express refers to standard or is this a different plan all together ?

any kind assistance would be greatly appreciated.