The fighter in the second picture have the same wing shape as the F-16XL, with its inlet positioned behind and under the nose too, and also features a
cannon carried on the port side.
I don't know for certain, although I'll bet Waynos can find out - but I think both of these are artists renderings of various proposals for the
LightWeight Fighter program of the 1970's - this is the program that got us the F-16 and the forerunner concept of the F-18.