The UC First Blood is actually a pretty accurate copy, cosmetically, of the Lile original. Of course, it has not been properly heat treated and tempered, which Lile told me was the strength of his survival designs (along with the special method he used to attach the blade to the handle). The UC Rambo II versions I have seen are flat out pieces of junk. It does not even match the Lile original in thickness and weight, and the workmanship is awful.
I must admit I am speculating on the whole "saw teeth" legend about Rambo's platoon, but the two knives have different numbers of saw teeth, so that does not seem to make sense. (I have a hazy memory that that was the purpose of the "scallops" on the Rambo III by Hibben.) Also, the saw teeth were a stylized version of the teeth on the Randall Model 18 which was meant for ripping through metal, specifically the thin skin of a downed aircraft. This was requested of Randall, who felt saw teeth would weaken the blade, by a military medic who was afraid of being trapped in the crumpled fuselage of a helicopter. The Lile version is also suitable for that purpose, although they do saw wood. Anyway, why would you saw wood in the wilderness when you could chop it with the blade?