I have had a kmc link on a campag record chain for ages and there are no problems.
There's much less variation in width between different n-speed dérailleur chains of the same n than there is between different ⅛" chains, because manufacturers of ⅛" chains have no restriction on plate thickness; plate thickness on the heaviest ⅛" chains is about double that on the lightest ones.
There's much less variation in width between different n-speed dérailleur chains of the same n than there is between different ⅛" chains, because manufacturers of ⅛" chains have no restriction on plate thickness; plate thickness on the heaviest ⅛" chains is about double that on the lightest ones.