Lavi and j-10 look nothing alike
The back of the Lavi aircraft has no obvious bulge, while the back of the J-10 aircraft has and the bulge on J-10 raised the cockpit height and improved the pilot's vision and some of its wires is in it. Lavi aircraft used a close-coupled canard, while the J-10 uses a mid-range coupling canard; Lavi type adopts fixed Pitot tube inlets similar to F-16, J-10A innovatively uses binary adjustable inlets, later J-10B and J-10C used DSI inlets. The wing structure of these two are also very different, J-10 has very A clear blended wing body at its end of the wing and Lavi doesn't.
Mostly importantly it is the size, J-10 is about the same size Rafale and Lavi is significantly smaller.
not like someone could simply look at a photo and “copy” a plane with similar ability.
Otherwise, it wouldn’t take India 30 years to develop the HAL Tejas, which Indians claiming to be 4.5 generation but actually look like a 2nd or 3rd generation antique lol