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according to the Full Components List in the Sun System Handbook they are identical (527-1171 CPU, 371-0083 Fan/Heatsink).
Review chapter 3.2.1 in the Sun Ultra 45 and Ultra 25 Workstations Service and Diagnostics Manual regarding DIMM Configuration Rules.
For anyone interested, moving the processor from one Ultra 45 into another does seem to have worked. The system now sees two processors.