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I agree with Cammy, their down color is just variable at times, as you have noticed with your lorps. Once they begin to feather, you will probably also notice that they have white feathers in their wings. This is also normal and usually they molt them out in the first molt.

The australorps in the OPs post are full australorp, their coloration is indicative of nothing. The only time that white on the heads of the males will stand true is if it a solid (non-barred) male over a barred female, which results in sex-links.