As far as I know the only difference in alternator pulley locations in that whole era is between AC cars (double pulley) and non-AC cars (single pulley).
As mentioned before, the only reason to swap to the matching pulley is to solve an alignment issue between the two belts. If the belts are farther apart on two of the pulleys, and you align the outer belt, the inner belt might be off a quarter of an inch - measure and compare distances between the bottom of the grooves.
