The Super 7/Sabre II project was completely different to the FC-1/JF-17 project. The Super 7/Sabre II was superceded by an all new agreement signed in the mid 90s between the Sharif administration and Chengdu/CATIC to design an all new design, not one based on a modified Mig-21F13 airframe. This was when Mikoyan was brought in as a consultant to provide assistance based on the data from the Mig-33 project, which later evolved into the FC-1/JF-17. There's Flight global news articles reporting this back in the 90s which I still remember reading.
The original article is archived somewhere on the internet, but the headline is as shown below from an article dated in 1995.
CHENGDU AIRCRAFT (CAC) has teamed with Mikoyan MAPO to design and produce a new single-engine fighter to replace China's now defunct Super-7 project The FC-1 is being developed as a private venture funded by CAC, China National Aero-Technology Import and Export (CATIC) and Pakistan. The...
www.flightglobal.com
"CHENGDU AIRCRAFT (CAC) has teamed with Mikoyan MAPO to design and produce a new single-engine fighter to replace China's now defunct Super-7 project"
Ironically, the Super 7/Sabre II design essentially lived on in the form of the FTC-2000/JL-9 trainer.
And yes, the JF-17 is a statically neutral design, as I've mentioned before.