The question of when Israel actually pulled out of the J-10 is up for debate. Officially they backed away around 1990, but they maintained offices in China for several years afterwards, probably still today. In any case, Israel delivered a complete design. There were already 2 flying prototypes, and 4 more in construction when the US pulled the plug.
The J-10 project did go through a few redesigns, but we can ignore anything pre-Lavi as irrelevant. The only design changes relevant to the J-10 today are the post-Lavi changes. The J-10 is not an evolution of a previous design with Lavi influence- it is the end product of the Lavi design with Russian and Chinese influence.
I would guess that the Russian help was mostly re-engineering the aft fuselage and modifying the airframe to accept the AL-31 engine, and possibly some cooperation from Phazotron on the radar. They may have helped some with manufacturing details on the composites in the wings, etc, stuff that was too high tech for China's manufacturing capabilities at the time. There's really not as much F-16 in the Lavi as it appears. The forward fuselage and intake are similar, but the airframe and wing are all Lavi.
So 90% of the J-10 is still Lavi, and 90% of that development was US dollars. 40% of the components were being made in the US when the program got the ax. All in all, it was a disaster from the US perspective. 2.4 billion dollars down the drain, and much advanced technology given away.