The clear luminosity of person A would be the same clear luminosity of person B.
It's like 2 people wearing blindfolds in a brightly lit room, and then taking the blindfolds off.
they both experience the same light.
Even if A & B continue to have differentiating mental or physical characteristics,
these individual traits do not contradict the oneness of realization
because both are included in it.
A & B both see the individual characteristics as mere appearances,
as manifestations of dharmakaya
and so those appearances do not create obstacles to realization.
This is somewhat similar to the Theist view that all phenomena are aspects of Brahma
except that instead of a personification,
all phenomena are simply aspects of the same overall truth.
Everything is included in an infinite reality.
It's like talking about the properties of fire.
It produces light, it produces heat, it can spread, it can be contained, it can be easily extinguished, it can be difficult to extinguish. it can have different colors, it can help, it can hurt, and so forth. But these characteristics, although sometimes seemingly contradictory and individual traits, are actually all manifestations of the same fire.
Whether a fire hurts you or helps you, meaning whether it is good or bad,
that depends on your temporary situation. It doesn't change the nature of fire.
So, the infinite truth of things is expressed as finite (individual) characteristics
based on the projections of the unawakened mind.
and the projections of unawakened mind arise due to temporary conditions
and the temporary conditions arise due to karma.
Now, the question might come up,
If the (individual) thinker is, after all, just a thought (a projection of mind), who is thinking it?
is that what you are asking?
.(By the way, I may be totally wrong.)