If this news is true it's a serious insult to the JF-17 Thunder. It costs overwhelmingly less than J-11 B's in terms of both procurement and operation. The Navy gets the smallest portion of Pakistan's defense budget and operates on very tight strings. It's not even thinkable that the Navy would choose to induct completely new dual engined platform while the Air Force (who has a much more generous budget) has already been integrating JF-17 squadrons and also complimenting them to be better than F-16's in "some aspects", and the JF-17 overall being able to take out "any of the current threats". I've also heard that Pakistani pilots have flown Chinese J-11 B's alongside the Chinese in Joint Exercises, perhaps even taken out other Chinese J-11 B's with their J-11B or JFT or possibly both. So I see no reason for Pakistani Navy to induct a new so called Chinese aircraft with controversial origins, performance and Russian engine. I would rather suggest PN to develop a JF-17 Naval version or if you got the money, go for Gripen all the way.