According to the Insurance Institute for Highway Safety (IIHS) collision repair sheet metal, including fenders, door skins, bumper covers, and the like, are irrelevant to vehicle safety.

In a 40 mph crash test, the driver space was maintained well in both Toyota Camrys, with and without cosmetic crash parts.
According to the IIHS, the crash performance of parts from non-OE suppliers would have no impact compared to cosmetic parts from original-equipment manufacturers in terms of their safety.
Results from recent crash tests conducted by the IIHS show cosmetic parts did not impact the safety performance of the vehicle in crash