Russell maintained (sez Feser) that the same reality is neither mental nor physical, but a third "neither" that presents itself in two modes. The difference between the two is one of representation. When I consider sensation in the first person, I see that I see color. When I consider it in the third person, I see a brain. As Feser said, this is an epistemological difference but not a metaphysical.
To the latter I would counter that there is not difference in mode of presentation without a difference in the thing presented.
One mode of presentation considers it according to its matter, the other through its form. The identity statement--"the brainy entity acting in such and such a way is Jeremy perceiving color" is essentially "entity x viewed in terms of its proximate matter is the same entity x but now viewed under its form.":
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