CriticalThought
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It can only be answered after the Specs of Block-III are released. If Block-III is going to be based on JF-17 B with increased length and wingspan. It would be impossible to upgrade earlier blocks to Block-III standard. If Block-III is going to retain the same specs of Block-II, then perhaps we might see earlier blocks upgraded to Block-III during one of the major overhauls in the mid-2020's
https://quwa.org/2017/11/12/first-jf-17-will-undergo-major-overhaul-avic/
China has developed an air cooled AESA radar to retrofit Block 1 and 2. IRST could theoretically be covered with a pod. I don't see any reason why HOBS + HMD/S couldn't be backported once available. So yes, they should get closer to Block 3 but probably won't get every upgrade such as lower wing loading.
Control surfaces completely neutral.