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Unfortunately engine management diagnostics are often carried out by reading the fault codes that the cars ECU is telling us, So its very likely that your cars ECU did have a throttle pedal fault stored in its memory, and 9 times out of 10 we take it as read that this is the fault,
Unfortunatly if the cars ECU itself is faulty then it can often throw up all sorts of fault codes.
Do we suspect the ECU is giving us false information? or do we go with the faults and cross our fingers? Many people might suggest that once the throttle pedal fault has been read in the memory we should then go the extra step and actually test it manually by reading the resistance figures however in everyday practice this doesn't always get done because A: not everyone has access to what readings it should be showing, B: it takes more time, and C: if the ECU itself is ok then usually the fault codes are acurate.
A faulty throttle pedal on a vauxhall is not unhead of, I have fitted a few myself so I'm not sure I would point the finger at the technician who fitted it, If the ECU is indeed faulty (again quite common, usually on certain models because of where it's located) Then just bear in mind it was "your" faulty ECU that gave the false information.
I doubt in answer to your last question that one of the components has/had affected the other, If they are both faulty then pure coincidence.
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