I'd say it's a simple matter of having the correct parts. The 74 and 72 I'm sure are different. Again if you go to MyMopar you can download service/ and parts manuals I have a parts book from a 74 but not 72 If you have a way of adapting them, and are not terribly concerned with absolute "correct" I would not hesitate to cut/ silver braze etc as needed.
I am from over a decade, in a previous life, of stationary HVAC/R equipment, where most all TXV's were either flare (SAE 45*) or braze fittings, and wish the auto industry had done the same
Of course nowadays, even in the stationary equipment end, getting replacement parts for R12/22/502 systems is pretty much impossible
