Narcissistic patterns, to use an analogy, may have similar phenotypes but different genotypes. For some, it is a manifestation of a hollow or even sociopathic core and, on the other end of a spectrum, it can be a defensive style. Either way, they tend to use people for their own purposes.
Narcissistic Personality Disorder: Rethinking What We Know
Watch out. Assess peoples' characters, if you can. Watch out for flatterers and users.