The difference is more than 7" or 8". A '32 Victoria/B-400 floor pan is shown in the first photo below. The flat portion beneath the front seats is unique to those two body types. Everything behind that flat portion is common with the deluxe coupe (except for the seat riser which is also unique to the Victoria and B-400). The second photo is of a deluxe coupe floor pan less the pan beneath the front seat. The floor pan beneath the front seat on a deluxe coupe is common with the phaeton, standard coupe, sport coupe, and cabriolet. It is shown in the third photo.