Fleet vehicles are defined by managed use; passenger vans are defined by their passenger-carrying design. An organization’s fleet can include cars, cargo vans, passenger vans, trucks, or other vehicles. A passenger van can belong to that fleet or be used privately. The two descriptions answer different questions about the same vehicle.
That difference matters when choosing, assigning, or inspecting a vehicle. The fleet label tells you to examine responsibility, records, and availability. The passenger-van label tells you to examine seating, access, restraints, baggage, and the occupied load. Neither label supplies all the information in the other.