I just replaced my rear DSP33"s with in wall DSP420's. Do I need to create a whole new set up configuration? I couldn't find a fast way to just cut out the DSP33's and replace with the 420's.

Is it even necessary to do this? aren't they essentially the same?

G61R, HD621, 3xDSP33 (front, center left), 2xD1500 subs, 2xDSP420 (rears), Sonos everywhere.