That list is not entirely accurate.
K-Frames changed about mid year for the 318, 340 & 383 cars. The early version is 2962012
The 3583052 K-Frame replaced it & was used on the 318, 340 & 383 cars including the T/As & AARs.
I do not know why they stopped using the old one or what the differences are between the two. If I get time I can check through all the broadcast sheet copies I have & see if I can pin down a date for the actual change.