Your duckling with the facial stripes looks a lot like several I have had. The first, my drake, who is 1/2 Khaki Campbell and 1/2 Silver Appleyard. This is him as a duckling:
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Juvenile:
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Adult:
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I suspect yours is also a drake because the feathers above his tail look dark and solid. Is your duck quacking or still peeping? If he is still peeping, good chance he is a boy.
Your other duck reminds me of some ducklings I recently hatched (my avatar).
View attachment 2426405My drake was their father and their mother was a silver Swedish. Mine were a color called lavender which results from having the allele for blue and the one for brown. Mine had a darker bill and a bib so not the same, but I wonder if yours came from something like a blue Runner, Khaki cross?? Just guessing. This is her and her sister now (on right or in front):
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