Will the fenders from a 1974 or 73 Chevy Nova fit on 1972 nova?

While '73 and '74 Chevy Novas share many similarities with '72 Novas, the fenders are not directly interchangeable. There are subtle differences in body styling between those years that prevent a direct bolt-on fit. You might be able to *modify* the fenders to fit, but it would require significant bodywork and likely custom fabrication. It's not a simple swap.