The 36 shown (midle pic) was a prototype ( only one built) to test the lifting strake placement. Bertram then built the 16 of the 38 comps. and only about 1/2 are running today. Racing takes it's toll. They got busted up, flipped etc.
The 36 had a plywood deck, and i believe it's Phil Lewis in the boat.
The two boats look quite different but the running surfaces are identical - except length. A 20 degree deadrise V and a pad.