All the seat pans and foam are the same. Only the seat colors are different. Watch out for chalky seat pans and crumbling foam on older seats if they've been stored outside. Seat bolts can snap off inside the plastic as well. They're a drag to extract.
by the way, have you heard of Mrs. Moshman? I've searched and cannot find much on her. I've read she does awesome work on covering seats. I would like to contact her IF I can find the information.....she's so hard to find! lol