While I personally do NOT believe S&W did anything different with heat treatment or metallurgy from a magnum to a special, (see model 10-6 .357 Magnum restamped model 13) I still think the OP is asking this question:
Can one load hot .38 special ammo to .357 magnum pressures and velocities? Sure they can. Skelton did this for years before he could get his mitts on magnum ammo.
Should one use this is non-.357 magnum revolvers? Up to them. I wouldn't do it in a model 12, but I would and have absolutely done it in heavy barreled model 10s.