Wasn't the British Midland crash at Kegworth a then new B737 model (the -400) where the crew had only had an OHP session to get to know the differences between the new -400 vs the -300, and it was the failure of this assumption that was one of the holes which drove the decision to shut down the wrong (working) engine? There's way less difference between a -300 and a -400 than between an NG and a MAX surely?