But there are all those variations in on-chip cache and on-CPU module cache, and then the question of whether the 1.3 GHz chips might be more overclockable than the 1.25 GHz, or perhaps were built on the same die and so are essentially already overclocked 1.25 GHz G4s....

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They're essentially the same. All of the CPUs from the 667 MHz and up have 256k of L2 and at least 1 meg of L3 cache until you get to 7447 G4s, although there was a 733 MHz QuickSilver model with 256k of L2 and no L3.

As far as I know, all Apple 167 MHz CPU cards have 2 meg of L3 cache and 256k of L2 per CPU, and the Sonnet has 512k of L2 and no L3.