There is nothing objective in picking some specific subset of logos for comparison vs all possible logos
You created a subjective measurement.
You created a subjective measurement.
There is an infinite number of ways to design a black logo. There is an infinite number of ways to design a blue logo. So which infinity has more distinctive logos?
Anyway, for any distinct set of black logos you can map them to a larger set of blue gradient labels therefore the number of distinct blue logos with gradients is larger.