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Re: disc brak conversion
You're likely looking at disc brake and DROP SPINDLE conversions (lowers truck 2-2.5" in front depending on which you get). As stated above, every 1971/72 truck that rolled off the assembly line had disc brakes. Your frame or cab may have been swapped at some point. There is a VIN on the DS of the frame, see if it matches your cab.
Anyway, yes, if you're looking at DROP disc brake spindles there is a difference. 67-70's used different lower ball joints and outer tie rod ends than 71/72 trucks, so that's why the drop spindles are different. HOWEVER, the lower control arms are the same, so you can install 67-70 ball joints in 71/72 control arms and vice versa.
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