Yup. Pretty much interchangeable. The cabs are different but not because of the year. If the cab came off a 2wd/auto, it'll have a small hump floor. All manual trucks and 4wds had large hump floors.
Ike
91 W350 SRW, 3.07's, NV4500, 370's, THD LPPP, Super HX40, 2nd gen IC swap, BHAF, Isspro's, 2" lift, 285's on 3rd gen 17"'s. 04 VW Jetta Wagon TDI 5speed