Yes they are, however the seats for the cargo cover are quite a bit in from the sides, sitting on a huge empty piece of plastic... might be worth a measuring exercise. The D2 cover has a spring in one end to keep it seated, and it's a pretty snug fit when rolled out.
EDIT: I realized the above sounds a bit misleading. I meant "yes they are" as in "yes they are wider". I doubt a D1 cargo cover would fit in a D2.