the rear seat back's are different and can't be used in a coupe,i'm not too sure about the rear seat bottom's.
the front's can be used in a coupe.you can remove the headrest and switch over the coupe seat belt loops to the vert seats.the seat belt loop's are attached by two torx screws on each seat if i remember correctly.
also the vert seat's don't recline as far back as the coupe seat's do.
i remember seeing a mod to allow them to recline farther,but i can't remember where,sorry.