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You won't have much of problem telling them apart. The Blacks will be Black and yellow and the Blues will be Blue (gray) and yellow and lots of times look like they have mascara around their eyes. Any of the blues that are so dark they look like Blacks would be too dark as adults usually anyway. and if there's any doubt you can wait a couple weeks and you'll be able to tell from wing feathers.
You won't have much of problem telling them apart. The Blacks will be Black and yellow and the Blues will be Blue (gray) and yellow and lots of times look like they have mascara around their eyes. Any of the blues that are so dark they look like Blacks would be too dark as adults usually anyway. and if there's any doubt you can wait a couple weeks and you'll be able to tell from wing feathers.