I have two African that we got from a local feed store. None of them were sexed and we are not skilled enough to sex them ourselves. They have not matured, but I would love to know now.
Can you get a photo with them standing together broadside ? With my Africans the male is taller, has a more chunky looking bill and just looks more masculine somehow.
And they do look like Chinese now but I think my females took awhile to get the knobs on their bills.
Due to the crooked neck it is hard to tell which is taller than the other. The one with a crooked neck is larger overall, but the other is the only one showing signs of a knob. I also know that the normal one has a deeper more defined honk than the other