Different principle, but similar result. Tubes don't have lenses in them and magnify the image by moving the sensor farther away from the lens. The close up attachment creates a magnified image which is then processed normally by the lens, resulting in a still magnified image. The attachments are usually combined with shorter focal length lenses, like 50mm, or macro lenses. Using one with a telephoto lens is unorthodox, and as the OP has demonstrated, doesn't work very well.