Now that you mentioned it, the L-15 does have a slight resemblance to the F-16.
And the F-5E, F-18 and others. Its the nearly straight wing with large LEX concept. Compare with the nearly straight wing without LEX ( F-5A, F-15, MiG-25, -31 ), swept wing with 57 degrees leading edge sweep ( MiG-19, Su-7 ), the tailed delta ( MiG-21 ), tailless delta ( Mirage III &c., F-102, -106 ), the swing wing and the canard delta that is now so popular. MiG-29 and Flanker have relatively small LEX. Several concepts to build supersonic aircraft.