I swapped my ST doors for SW doors. The hinges are identicle. The locks, latches and strikers are different. The strikers (or whatever they are called) that are mounted on the truck body are different diameter than on the ST doors, so make sure you change these out too. Also, there is a slight difference in what mounts to the bulkhead that keeps the doors open (YES! with SW doors, they can stay open without a bungee!).
Basically, no problem whatsoever. No holes to be drilled, welding or anything...just bolts right up with the correct hardware. Also, with the SW doors, you won't get D90 elbow...