they are one in the same YOU can interchange safely ,the identical 308 win is the 762x51mm and vers vica,there is a lota bull floaTING AROUND the round was developed at high chamber pressure 50,000 to 60,000 in an attempt to duplicate 30 06 performance,with less brass,some 762x51mm are down loaded for automatic fire,cetme rifle,although some spanish loads top 2900 fps with a 147 grain pill
I have fired lots of commercial 308 w thru 7.62x51mm rifle with no problems.
