at 200MHz, the 604 is ~27 MIPS faster BUT the a4000 because of it's design allowed for a more faster ppc subsystem, so all benchmarks regarding memory read/write etc, are 2X the speed on the 4000... a 604 on the 1200 would not help...
so the conclusion is that the A4000/3000 CPU slot is faster and more efficient than the 1200 cpu slot...
also the 1200 lacks many components the 3000/4000 have...
