HP 42S Version Speed Variation

[Gerald H]

Edit: extremely sorry, but in the text below 200 & 280 have been transposed. The timing differences between the two models are correct, merely model allocation is false, so the substance of the post remains valid.

For the same arithmetic calculation, using the same algorithms,

serial nr 2914S30950, version A, took 280s, whereas

serial nr 3144S06635, version C, took 200s.

Is such a variation between versions expected/common?

Incidentally, the much maligned HP 35S took 140s.