Little Stint would be a rarity I think, these should be Red-necked.
A
Is a Sanderling!
RB
I can see the argument for a Sanderling, but I still think the bird on the right looks more like a Red-necked in moult into breeding plumage. To me it looks similar in size to the stint on the left. The bill looks fine-tipped and slightly decurved, unlike the straight and thicker bill of a Sanderling. The breast pattern also seems slightly more like a moulting stint - some solid brick-red feathers emerging among greyer feathers and with a white chin, not the dark-tipped chestnut feathers of Sanderling.
It would be useful to see photos from another angle if they are available.
The seemingly rather fine-tipped bill is the main reason why I wrote 'should be Sanderling'. I agree the difference in size to the Stint should be more obvious... hmmm
Any more pics?
I'm not sure that I know what you mean by coarse black spotting to the crown... Very recently photographed the attached Sanderlings on Heligoland and I find the crown looks rather similar to the OP, no? Also breast pattern... Generally I find the OP picture quite tricky also because of the backlight. I'm not saying the right OP has to be a Sanderling only that I'm not competely convinced yet it is a RNS.
The result is that the head pattern is globaly more uniform in sanderling than in RNS.
But anyway, I am not sure we need to get into that level of details considering that the breast pattern and colour should readily point towards RNS. And to add another point: the amount of tibia visible is not the norm for a resting sanderling.
The right hand bird is a Red-necked Stint. Whilst the left hand bird does look longer-legged above the knee (supportive of a Little Stint) it’s impossible to see much else from this single shot so we should assume it’s a Red-necked Stint.