The 002R just doesn't have the control surface. If you're using ProTools, then everything else is pretty much the same. My understanding is that they use the exact same converters, exact same mic pres, and exact same software. Only difference is that you get no motorized control surface one the 002R.
You can also get a D24 core card and a DSP farm for just a little more money as an 002R, and then you get the power of TDM, and it's fully expandable. If you can afford a regular 002, then you can afford a full blown D24 system...which is a much better deal in my opinion.