The greylag-type geese are pretty laid back about other goslings, though they can get a bit bullyish..maybe nip, maybe 'graze' them, but in general nothing too bad, you just have to keep a little eye on them to make sure. Going by what I hear about Chinese, (as you know I´ve never had any), and what I see of my neighbour´s, I would imagine that maybe their natures aren´t as easy-going. (Feel free to contradict, anyone who has chinese), so maybe you´re going to have more of a battle on your hands. Can you not get some 1/2 or 1" weldmesh so that no-one can hurt anyone else, and in time they will get used to each other. When they´re 4 - 6 months old, you´ll hardly see the difference in them and they should be ok by then.