Maybe I misunderstood Your post but You said:
1. These should be the J10B late batch model (above picture) powered by FWS10A or FWS10H with type A nozzle and
Wrong, since the image on top shows a J-10C with a standard AL-31FN Series 3 nozzle ... exactly the same as the J-10B in Zhuhai featured, since both B & C models use the same engine. There is no "type A nozzle"
2. J10C prototype (below) powered by FWS10AII with type B nozzle, the one displayed on the Zhuhai show.
Also wrong, since this one is a J-10B with a WS-10, the same nozzle as all WS-10 engines have and not as the J-10B in Zhuhai had. Or did You mean the WS-10B on display ? Then You are correct, but that makes this aircraft still not a C.
Or can You please explain what You meant with WS-10 type A or B nozzle ??
Deino