In the sense that the two planets move together and has intelligent beings with their own forces and particles, but they just do not interact with (are invisible to) us?
Answer
In principle you could, and there are some theorists that believe that dark matter has its own interactions. However, unless there is some fundamentally wrong about our understanding of earth's interior, we could not have a dark matter planet superimposed with the earth, or we would feel the additional gravity force, which nothing indicates it is there.
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