Oh,yes, it probably would have been way, WAY easier! I can't tell you how many times people have told me parts from the Jo-Han '70 and MPC/AMT '69 interchange so easily. Trouble was, I had no chassis to the '69 (in fact, all I had were the interior tub, ram air ducts, and the optional Torque Thrust wheels). And since I messed up the body on the '72, I had a huge box of spares from that kit to use, so I just went that route.
I will say the Revell chassis needs a lot of trimming and fitting to fit, and the wheelbase needs a bit of adjustment, but using it not only spared me having to buy a '69 kit, but gave me the more detailed engine bay as well!