That would be a good comparison if the old shock wording had said RR shocks are prohibited unless fitted as stock, but that's not what it said. It was very clear that replacement RR's are not allowed. There is no reason to change that. The legality of stock RR's was debatable, with the new wording, now that's clear.
As for the keyway on a replacement timing gear, if it doesn't match stock dimensions (including angular relationship to the gear teeth) it's not legal.
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