Even such detailing can wind up surprisingly similar for cars from different makers. Here we consider the rear aspects of Ford's Fusion and Chrysler's 200.
To me, the Fusion and 200 look pretty much the same at first glance. Aside from the similar basic body shape, we see that the side and rear window shapes are nearly identical, as are those lips at the lower edge of the bumper / strike panels.
Remaining design features differ in detail, but not by much: they are styled in the same spirit. These details include the shape of the tail light assemblies, the lower side character shapes extending aft of the rear wheel openings and the depression where the license plate is housed. The Chrysler has less sculpting at the top of the trunk lid and alongside the backlight, but these are minor in the context of overall appearance.