Which Duck Breed slayed these eggs

[Unruffled]

I have attached a picture in which the top row are the mystery eggs ( they are slightly blue in color), the second row is my Pekin’s egg, and the third row are my Muscovy’s eggs, just for comparison.
I have never seen these eggs here before this week. I hatched the following breeds in April:
Call-3 females, Rouens-4 females, Indian Runners- 1 female, Welsh Harlequin-2 females, Pekin/Khaki mix, Pekin/Blue Swedish mix-6 females, Any opinions will be greatly appreciated.
Thank you!

 

[Duck mommy 2019]

how old are your ducks? the first month or so the eggs may look different, until they get into a routine

 

[Ratchnick]

How much do they weigh? Grams would be a helpful unit.

 

[Unruffled]

how old are your ducks? the first month or so the eggs may look different, until they get into a routine

Sorry for my delay. I have two ducks that have been laying for a while. Both are 3 years old and I can pick their eggs out of a line up. But ALL of my other ducks were hatched in April of 2020. So if they’re laying, they will have just started. I’m just curious to know whose starting, that’s all. What you say makes sense. Their eggs may not look “right” for a while when they first start laying. Thank you for your reply.