since you're running them autonomously, I don't think it matters how you name the VSC's, whether they are all the same, though it's probably more difficult administratively to keep them different between APs. However, on newer APs in autonomous mode you can download the config from one manually and upload it to the others to save time when you need to make any config changes, so I think that is probably also the case with the older APs, but not sure.