Anakins is actually different than Luke's idk why but they changed it even though its the same saber. But Luke's changes from ANH to ESB too which i also think is stupid. But Anakin's has gold plating on the activation box and around the switch area it is not smooth. Also the button near the emitter is a different color. The only difference from ANH to ESB is that the activation box changes from bubbles to a ridged plate. Darth vader's lightsaber from Ep III looks nothin like any of his others(its gay) between ANH and ESB only one thing changes, red crystals near the emitter in the ESB version. It does bear a small resemblance to the skywalker lightsaber. the grips are alike, the style of emitter, the activation box area is the same except for color. Here's Anakin's(Bottom) and Luke's(ANH,top).