PowerPC G4 Upgrades Direct from Motorola?

Gizzmonic asks: "I was looking at PowerPC upgrade cards for my Mac G3 Blue-and-White and I couldn't help but notice that the offerings by PowerLogix and Sonnet are quite pricey. So, I started poking around Motorola's site looking for the G4 or my dreams. I could probably pull a few strings at work and get them to order a G4 direct. Is there any reason that a G4 from Motorola wouldn't work with the ZIF socket on my motherboard? (Yes, I know about the G4 enabler software) Ordering from Motorola or one of their suppliers could potentially save me a lot of dough, but I'd hate to plunk down the money for an incompatible CPU. What do you folks think?"