You used lenses proportional to the sensor size. The DOF, at the same relative aperture and FOV, is proportional to the cropping factor. This is shown in your example. The key phrase in my post is "absolute magnification", regardless of the sensor or film size. The subject would be the same size on 4x5 film as 35 mm (e.g., 1:1), although the 4x5 would have a much larger FOV.