From what I have read, the white guineas in Australia do not react the same genetically there as the white guineas we have here. Breeding a white guinea here to a white guinea will only produce white guineas. Breeding a white guinea with a colored guinea will only produce pied guineas. Breeding a pied guinea to a pied guinea will produce 25% white guineas, 50% pied guineas and 25% colored guineas.
I have seen no evidence that breeding a Pearl Gray guinea that has one white wing feather with another such bird will produce pied guineas here. I am not doubting you that such does occur in Australia. I just have not seen any evidence of it happening here.
I believe that there is a person on the
Guinea Fowl Forum that is located in the northeast U.S. that has some red eyed Cinnamons. How she got them is information that I do not have.