Are ccd plane and focal plane of digital camera the same plane?

Of course! The purpose of focusing is to obtain a clear image of the target object on the photosensitive element. The definition of focal plane is the plane where the focal point is located, so of course, the focal plane should be pulled onto the photosensitive element! SLR cameras will mark the position of the focal plane on the top of the camera for manual focusing and ranging. This position is the plane where the photosensitive element is located.

Supplement: The focal plane must be on the photosensitive plane, but the definition of focal point in photography is the point that can form a clear image, so the distance from focal point to lens center in photography is the image distance in physics. Physical focal length refers to the distance from the parallel lines perpendicular to the lens to the point at the center of the lens, and the parameter 50mm marked on the standard lens is the focal length. Because of the different definitions of photography and physics, the image distance is not the focal length. Don't misunderstand me.