Wow, it's the FACE-face of the trigger that is different (so many complicated names for internals, heck, the trigger "face" could have been any part of the whole assembly to me). I guess it was so obvious that I missed it.
Geez... that's getting down to the nitty gritty, I guess. Thanks for the info, the stock trigger face does me no harm whatsoever. IMO if people feel the ridges are uncomfortable, then I really wonder if the "mountain" of a trigger safety distracts them.
Thanks again for the info Wayward, saved me the cost of a box of ammo and time trying to research what made this part so special.