They have:
80A-00 - 1.8GPM
80A-0 - 4.0GPM
80A-.5 - 5.2GPM
80A-1 - 7GPM
To my knowledge, they are all stamped with the appropriate part number on the housing.
They are all the same pump with different length gears. I don't know of any resources online that have measurements for the gear length in relation to the model number of the pump.
You may wind up having to call Enderle and ask.