My guess is that it is the exact same part. But it was mentioned that if had tighter tolerances. So they probably requested that the manufacture pick out one set that had tighter tolerances. (i.e. part binning, like Tesla used to do with drive motors, the better ones became performance, where the poor ones were labeled as standard.)
That could explain why some people report no vibration, they were lucky and got a set with tight tolerances.
If it works out for
@n2mb_racing they will probably update the official part specifications with the tighter tolerances and then create a new part number/revision at that time.