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There are a couple of branded versions of the Optima battery. Orbital is one, etc.
They don't have the same cranking amps, but they especially don't have the same reserve amp hours that the larger hawker batteries have.
# CCA - 1225
# Reserve Capacity 240 min
# Capacity - 120 Ah C20
# Usable...
http://www.milbatteries.com/hawker/index.html
There, the Hawker AGM batteries are what you are talking about.
Btw, all THREE of the trucks I just got have these! One set looks to be NEW.