who laid what? issues?

[Pinkston]

This is 6 eggs the first 3 are chicken the second 3 are duck the largest duck egg is from a common domesticated duck the other 2 are unknown we have the domesticated, a crested and a cayuga all living together the domesticated is a proven layer gives us 1egg a day the other two are still young and have never laid anything. The tiny egg has a slightly different texture and a mild gray tint(makes me think the cayunga laid it) I found the tiny one in the water. Any ideas who laid the 2 smaller eggs and is the tiny one a sign of issues in one of the ducks being that its so small and was in the water. Any help is appreciated these ate our first ducks so still learning about them