I've been wondering this same thing myself. My tom is split to narri, so I expect narris and golden narris, as well as bronzes and red bronzes from some of my hens. I've noticed that some hatch with 3 stripes on their head, and some hatch with a cross on their head. I thought that might be a way to tell. So far at one month old, the crosses and the stripes are feathering the same.(no clue how to tell them apart)