Broad-billed Sandpiper
Calidris falcinellus
Broad-billed sandpipers are small waders, 16–18 cm long, slightly smaller than the dunlin, but larger than the little stint; it has a longer, straighter bill with the tip distinctly kinked down, and shorter legs than dunlin. The breeding adult has dark brown upperparts patterned with narrow, pale feather fringes, and white underparts with blackish markings on the breast. It has a pale crown stripe, and a distinctive double (split) supercilium.
ID text from Wikipedia, CC BY-SA 4.0

Sharp-tailed Sandpiper
Calidris acuminata
A small-medium wader, the portly sandpiper has a pot belly, flat back and somewhat drawn-out rear end. It has a mottled chestnut-brown upper body with sharp-looking feathers with a dark centre, a chestnut cap on its head and a brown stripe through each eye. Its bill is dark grey to black and straight, and its legs are olive- to yellow-coloured. The underparts are white or paler in colour, with the mottling similar to that on the breast and sides of the belly. The plumage is more vivid during the breeding season and duller in its winter plumage.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Broad-billed Sandpiper and Sharp-tailed Sandpiper.