Yep. Generally the shape of the P-7 is the difference you can spot. The tail one is what you can notice firstly However the PZL P-11a had the tail of almost the same shape. Another differences are the wing shape, the engine cowling and the fairing at the fuselage top behind the cockpit. Also you may notice the handle for a pilot while getting into, at the trailing edge of the central section of the wing.. The P-11c had them just below the windscreen. Additionally the engine mount of the P-11c was repositioned down in order to get better visibility while getting landing. The P-11a/b were quite similar in shape to the P-7, no wonder these were its development. But also there are differences that let you recoginse what type of the fighter you see.