Hi;
I am well aware of the differences. But, I can tell you this, they had a long enough flat area aft in the Well-Deck that I went 10 foot forward and created a W/T bulkhead with two doors for a Generator room. Using them in Oil Spill work required the extra power.
The thing that was most noticeable was this. Not remembering the Model numbers , the One boat had " Wet" exhaust and the Two boat had " Dry" exhaust. You sure as heck could tell the difference too!
Boat Three, Dry Exhaust, in single stack aft of the Wheelhouse, was a great platform for Salvage work. The Crane base was in the Well-Deck just forward of the Wheel-House on the centerline. That way we could use moveable weights for stability when doing a lift Port or Starboard.
The advantage was that if the vessel being salvaged came up in pieces we could set the stuff centerline forward of the crane in the lowest part of the boat. She didn't have the Generator room cause her engines produced enough power for that work.
I went so far as to convert one for a friend as a live-Aboard alongside an L.C.V.P. I had done too. The V.P. Retained it's forward ramp as a " Deck" connecting it to the dock when the owner was home.