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Two different birds?

Are these two birds Dunlin or Curlew Sandpiper? But they seem to be different, i.e. not the same kind.
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2020-11-13 MPNR outside northern hide

Both Dunlins, adult winter plumage. Note the rather plain face and short tibia; Curlew Sand should have a more pronounced hint of a supercillium and a longer tibia.