No debate, the safeties are the same except the early flat top for SA (WRA used flat tops) and the rounded top. Either will work in the modified pad M1 and will work in the M14 and M1Aicon trigger housings. The only caveat that comes to mind and if IIRC is the use of a rounded top in large pad (unmodified pad) trigger housing.

It would be nice to see your trigger group with the hammer forward.