For laymen's terms, sure. Behaviorally, the two types overlap quite a bit, and if you're dealing with someone who has traits of either disorder, then you probably should've been packing your bags a week ago instead of worrying about the minutiae of mental illness categorization.

If you are such an individual and would like to understand your own mental processes, then there are a lot of distinguishing factors between psychopathy and narcissism (particularly when it comes to underlying psychology), and there are also a lot of overlapping traits. NPD can have psychopathic traits. Secondary psychopaths can have narcissistic traits or NPD. Narcissists and psychopaths (both primary and secondary) can have antisocial traits or ASPD. Primary psychopaths can have narcissistic traits, but the underlying psychological make-up of a primary psychopath would make it very unlikely for them to have NPD.