The later trigger was a much nicer item. Ok, the original triggers were machined parts but were a horrible design. I guess it will have been cheaper but it was a step in the right direction IMO. Nothing wrong with the quality of the later ones.
The real gems if you can get hold of one is the “2 stage” trigger used on the Xocet and Stingray, possibly one or two others. They retrofit into all the Vulcan & Tracker variants. It’s not a true 2 stage but is a much improved feel over the standard unit.
Cheers
Greg