I think the thinking by Honda is that sedans are the "family car" so you'd want the tray & cup holders in the center back.... the coupe is for the rest of the world that would only occationally even need the back seat, so the split seat is more along the "other than a family" way of thinking.
I don't think they are the same width. So you couldn't just change out the back area for the coupe's. If I remember right, the coupe has a smaller backseat.... again, less built for "the family".
A three-way fold down for both would be an ideal plan.... so you still have the center cup holders & pass-through.
We use the full fold down feature 10 times more than the little hole or cup holders.
