Originally Posted by GWS CHEN
I read a report on newspaper years ago that this fighter was with something coming from "Youth", an Israel designed jet fighter originally which has not been mass produced by Israel.
If you compare photos of the Lavi fighter designed by Israel and the J-10 it will be apparent that the internal structure of both fighters must be quite different. The wing shapes are different and the canard on the J-10 is mounted further forward. This means that the positions of the bulkheads where the wings and canards are mounted are in different places.
The aircraft look similar but since the first aircraft first flew many designers have come up with similar shapes at the same time period. I.e. WWI biplane fighters or WWII monoplane fighters equipped with inline V12 engines