The term chimney sweep and chimney
cleaning are interchangeable industry terms.  In Jacksonville, FL, NE Florida and SE Georgia we use both terms.  Both a chimney sweep and a chimney cleaning refer to removing sooty build up from your flue.  So if the chimney sweep says he is going to clean your chimney, you probably wouldn't want to stick your arm up there while wearing your new white sweater.  But after the chimney sweep is done you can be confident that the soot isn't building up and refining in your chimney flue becoming extremely flammable creosote.  So whether you call it a chimney cleaning or a chimney sweep, or a fireplace cleaning in Jacksonville FL, NE Florida or SE Georgia you should have it done once a year.