they sell em as front and rear, but really its only the direction tha pads are facing, (and idk if the rear comes with the additional long noodle)

so if u need to put fronts on the rear, just swap the pads from left to right

i think the front and rear specific thing w/o telling you why or how to switch em around is to try and make it idiot proof, imagine if the directions said "in order to convert to rear brake flip pads"