The other 2 gray nose jet are Block-3. Check their serial nos 22-305 and 22-307. Initial batch of Block-3 most probably came with Standard KLJ-7. Somewhere around 308 or 309 onwards, you will observe the Nosecone changed, indicating they're carrying Aesa radars. 22-315 is the most obvious one. With slanted nosecone indicating AESA in it.
There is a pic of JF-17 carrying PL-10 on wingtips in China during testing. Just like HMD, Dual rack, extra Hardpoint and Ra'ad ALCM integration with Block-2 JF-17 Pics came much later ( After 1-2 years) after actual testing and operationalizing them. We should expect PL-10 and PL-15 pics next year
All 3 are Block-3 . One block-3 carrying Aesa, rest two are still carrying standard PD Radar