There is no difference in the steering column mount.
I installed a 1992 column in my 1979 crew cab when I did my Cummins conversion and it was a 100% bolt in.
I've had dozens of these trucks apart over the last 30 years. The only real change in the crew cabs between 72-85 was the heater opening in the firewall changed in 1981.
All doors, dashes, glasses etc will interchange.
Someone mentioned earlier about smaller back windows in the earlier trucks.
Yes, the glass was smaller but the cab window opening never changed, just the glass itself and the weatherstrip. It was just the shape of the weatherstrip changed in he mid 70's to allow a slightly larger glass to be used.