thanks ChatGPTThe procument fund( reportedly USD1.6 B) allocated for J10 seems to point out to J10B second hand, since so little money can buy 42 units.
No open information suggests Plaaf J10B can fire PL-15, which is best paired with an Aesa fire control radar.
Also J10B powered by AL31FN engine. This may be perceived to streamline maintenance, given flankers operated in Indonesia.