Hello and welcome to the forum!
There are a couple wikipedia articles about the J-9 and the J-12:
Chengdu J-9 - Wikipedia, the free encyclopedia
Nanchang J-12 - Wikipedia, the free encyclopedia
As mentioned in those two articles, both projects were canceled so technically the two designations are empty at the moment.
I do not believe that J-9 has ever been an official designation of FC-1. It is more likely that the FC-1 was called J-9 by military fans and observers before its official designation of FC-1 came out. I think it's a similar case with J-12. I do not think the government has officially announced J-12 yet for the new fighter, most of the time the official media refer to it as the Chinese 5th generation fighter instead.
Just my take on the issue.




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