Personally, and in a generalised/sweeping way, from how I taste things I think Cubans have more in common than not; that there's a core 'CC' base blend that makes up something like 40% - 60% of all CC, and the rest is made up of leaf that gives the uniqueness of each marquee/vitola. That base blend can sometimes be very prominent to me
For some the base blend is less prominent eg Bolivar is one of the more unique, but in others that base blends seem to be a higher % eg RyJ and Punch, or QdO and Cohiba, and the similarities can be quite strong
The blind tastings I've taken part in seems to underline this too (To my tastes)
From my tastings in for example 1960's Cubans, there doesn't seem to be too much of that commonality. Eg RyJ have been extremely unique and slap you in the face with what they are; I don't really pick up any core/base blend to which RyJ blends have been added, it's just straight 100% unique RyJ