One more thing - the mounting screw for the RRS D300 L-bracket fits through a slot, allowing you to position the L bracket in a manner that allows you to open the rubber flap for image transfer. If you were to try to use a D200 bracket, it would probably be difficult to open the flap. If you use a card reader that would not be an issue.
It is possible Kirk has modified the D200 L bracket, so if anyone has another version please post an image. I did try to use the D200 bracket before the D300 bracket was available. It may work in a pinch with a spacer.