Took me 30 minutes but here are the closes angles i could find.... In my opinion the newer picture has been taken from the right ( the person isn't dead center)...
View attachment 773094
Hmm .... the JF-17 Thunder Block-3 looks like it has visible structural changes, not drastic though, but still visibly changed.
1. Increased "Wing Loading" height, as well as over all general height of the aircraft.
2. Increased Wing length, which suggests increased number of weapons hardpoints.
3, Larger DSI, which suggests that there is a new engine for the aircraft (possibly).
4. Taller Vertical Stabilizer, with a larger EW Suite at the top.
5. MAWS (?) on either sides of the DSI
6. Wide Angled HUD
This Thunder looks more menacing and seems to have sharper and more powerful steel claws on it. It means that Block-3 can prove to be a significant leap forward for Pakistan Air Force's capabilities. It also would beg the question, whether Pakistan Air Force would increase the number of Block-3s from just 50, to perhaps 100, whilst retiring or reassigning (after updates to the aircraft) Blocks-1/2 to reconnaissance missions or modify them for CAS missions. As it seems to me that the Block-3 has been designed for a specific purpose, Air-Superiority/Air-Dominance.
I must say, I am truly impressed with what China and Pakistan have achieved with the Block-3 Thunders. Congratulations to both countries and their respective Aircraft Design Bureaus. Remarkable achievement indeed.