The dual CPU G4s are on a single module that goes into the same (one) CPU socket as the single G4s. So, no.
A Sawtooth is a way better score than a Yikes, IMHO, simply because the range of available CPU upgrades is much better, and cheaper, than those for a ZIF socket. And you have an AGP video card slot as well. Have a look at xlr8yourmac.com's G4 Systems page for more info.