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That's possible, even mallards hatched at that time wouldn't be in their full adult colors, yet.
Yes, Australian Spotteds come in three color phases, Green Head, Blue Head, and Silver Head. We raise all three varieties here. None of the three phases carry Pied genes, which is what has caused the excess white, especially at the nape, on the OP's birds. That would have been introduced by a breed other than Aussie Spot. The differences in the color phases all are the result of Blue dilution. Green Head= no Blue dilution, Blue Head= heterozygous Blue dilution, and Silver Head= homozygous Blue dilution.
There are also slight differences in plumage based on the light phase and harlequin phase as well, but none result in the excess white shown. The birds clearly though are in the process of molting out of juvenile plumage and will continue to change. The areas of white though created by the Pied pattern should remain and is not correct for pure Aussie Spots. I think it is attractive though and they are pretty birds. I bet they end up being even more gorgeous as they mature.
