Oh, OK.
I don't know for sure about the ones with less-obvious differences.
Unfortunately, I don't know enough about that particular breed & variety to be helpful there.
Very dark blues can look like blacks at this age, and will have to grow a good set of feathers before you can tell, but lighter blues are usually easy to recognize from the down.
For example, I see one on the far right of the photo that has a grayish color (blue) for the dark area on the back...