Guess that's better... heh.
I have the same system, a QuickSilver 2001 but with a 32mb GeForce2 MX card installed. I'm pretty sure the CPU's across the G4 range were the same (with the exception of the very first Yikes G4's), so they should work, however the bus speed changed between then. QuickSilver's have a 133MHz bus while i'm pretty sure MDD's have 167MHz FSB's, so an MDD CPU in a QuickSilver will run slower than it would in an MDD.
EDIT: Actually according to Sonnet's site the MDD processors differ from previous generations. I'm not sure what the overall difference is though.