Hello
short answer . . . nope :-(
Secondly its a 233 Mhz (but its not this the problem after all).
The problem, even if someone said that its possible (actually the board worked for some days or less)
is that you can't reworking a BGA CPU, on an already fitted CSPPC.
Even DCE, can't do it (or they prefer don't do it . . i don't know).
In few words . . . nada ;-)
Ciao
EDIT- and without speaking about desoldering the CPU by the MAC board!!! :-?
Other great problem is that the CSMKIII, lacks a lot of components used by the 604e.
(memory buffers, power regulation, and others)
CSMKIII_frontCSPPC_frontCSPPC_backCSMKIII_back