you cant just swap to an SC tranny by itself. you need new shifter cables, axles, clutch, and I think one of the tranny mounts need to be changed (might be wrong on that one tho.) So chances are its not an sc trans.
Easy way to check, look at the axles, it's an NA trans if they look like this:
its an SC trans if they look like this:
the transmission ends have obviously different flanges and the NA ones are thinner.