what cues are you going off? i think the belt lifter looks different than a 518.
sorry if I dont know what I'm talking about, I'm just going off what I saw online
i know both pics are of the same vacuum, I'm saying maybe the other kirby is a 518 and the seller unknowingly paired the acessories with the wrong kirby
i wouldent be able to tell you witch one is better until i see the other one. try ask the seller for pictures of the other vacuum and post them. and the trim is red so that vacuum is most likely the 518 just with an after market bag and cord.