When watching the Vid I could hear the hit/noise at the same time I see the Keyway on the crank.SO with that being said The spot on the crank gear Hit the cam into different Places, So would look closely at the crank gear having a Miss aligned tooth maybe. And with that much Hit/noise I would think you could feel that Hit when you turned it over slow. Yes the crank gear is the same. But they are made as sets or to be as a sets I should say.