A freight broker agent is someone who worker under a freight broker who basically finds loads from shippers and locates the truck to haul the load. The agent does the "sales" and "dispatching" of the load to the carrier and services the shipper. The broker for which the broker agent represents, does the back office such as billing, paying the trucks, collections, legal and claims (not the entire list).
An independent truck dispatcher is someone who represents multiple carriers to find freight, complete contracts, do billing and provide customer service. The dispatcher usually works with brokers as the carriers are very small and usually only have one or a few trucks.
While there are some differences, it is easy to be said that they do similar functions.
Course Video #1: Job Responsibilities/Duties
Course Video #2: Load Board & Common Equipment
Course Video #3: Types of Freight/Freight Management
Course Video #4: Load negotiations/Daily Routine
Course Video #5: Safety Rules/Forms & Agreements
Course Video #6: The Back Office (Part 1)
Course Video #7: The Back Office (Part 2)