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If the Australorps are carrying silver, then maybe. The birds themselves would eventually express sexlinked colorations, the females being buffish and the males being yellowish. The only question mark is how visible that would be at hatch. Editing because I realized I didn't answer your first...

Buff Orpington-Black Australorp crosses tend to be black with extremely heavy buff color leakage, often looking more like buff with black undertones. If your Australorp happens to be carrying silver instead of gold, then the males resulting from such a cross would end up being more yellowish...