The other significant change to Dori, Nori and Ori in the movie is that they are all brothers - Ori's grey hood colouring being markedly tinged with lilac to rein him in with the others. Aside from similar names and hood colours, plus their arriving together there's nothing in the book at deliberately earmarks these three as brothers. True, Fili and Kili would be the nearest comparison for hood/name resemblance, but the oppostie seems true with Bifur and Bofur who wear the same colours and are, as mentioned earlier, cousins. For myself it's not an argument I'm wholly convinced by - every other detail of kinship in the book is specified, but not Dori, Nori and Ori. I'm happy to leave them as they are.
And that's the end of the double-acts of Oaken's Twelve!