Yes the boxes are the same 77-79 have sae threads on the fitings and 80-93 have metric line fitingsThe gear boxes are just mounted different and use different pitman arms.
iirc I do believe that 74 used a reverse rotation box and the pitman arm has a different swing pattern.
I think that if you are going to go with newer box you will need a different drag link and steering arm to make it work
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