Query

customs house agent (CHA) is a person  licensed to act as an agent for transaction of any business relating to the entry or departure of conveyances or the import or export of goods at a customs station. (including preparation of accounts)

whereas

Customs broker is a person who does the activities that involves the "clearing" of goods through customs barriers for importers and exporters (usually businesses). 

you may note that some services are common tto cha and customs broker