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I think the discussion of the seven kindreds of Dwarves in 'Of Dwarves and Men' makes it clear that the Dwarves of Belegost and Nogrod are the 'Broadbeams' and 'Firebeards' as opposed to the 'Longbeards' of Khazad-dum - i.e. that each of the three kingdoms is the home of a different kindred. I think that in the earlier post-LotR writings, however, Tolkien may have envisioned more or less what you suggest - a single 'good' race of Dwarves inhabiting both Belegost and Moria.
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