Both are varieties of narcissism, but particularly those of the grandiose type may share the larger “Dark Triad” traits, along with so-called “Machiavellianism” (manipulativeness) and psychopathy (lack of remorse and empathy).
People high in both narcissism and Machiavellianism, Egan and team point out, are the ones who really get under your skin. Their antagonism makes them particularly hard to live with, and they’ll almost always get in the way of your accomplishing your goals. Machiavellian narcissists have mastered the art of one-uppance as they try to show their superiority while steamrolling over everyone else’s feelings and opinions.
Egan and collaborators pointed out that no previous researchers had looked at the role of emotions, especially positive emotions, in studies of the Dark Triad. They believed that narcissism might have differing relationships to happiness than would psychopathy and Machiavellianism. In other words, it might be possible to be a happy narcissist—but less possible to be a happy psychopath or manipulator.