It seems that similar situation is also with normal tiles with or without groove. Using same method as above (investigating my own sets and looking at the official pictures) it's very probable that tiles with groove were introduced only in 1976. So that would mean that all sets before that year should exlusively use tiles without groove.
So I suggest following: update all sets before 1976 (exlusive) to use tiles without groove and all sets before 1993 (exlusive) to use 2412a. The rest of the sets should be considered as being in transition period (how long?) and therefore can possibly use either variant. Most of the time the inventory already lists the newer mold but additional inventory with the older one can possibly be added on the case by case basis. Does this makes sense or has someone better solution (ideally not just "doing nothing")?