No, they are very different, and Personality Disorder's develop into your adolescence, and need no history of mental problems in your family to develop one.
AS is genetic and comes around early childhood when you're old enough to show signs. Some people are missed though obviously, and never diagnosed, or diagnosed as adults.
The Diagnostic and Statistical Manual of Mental Disorders fourth edition, DSM IV-TR, a widely used manual for diagnosing mental disorders, defines narcissistic personality disorder (in Axis II Cluster B) as:
A pervasive pattern of grandiosity (in fantasy or behavior), need for admiration, and lack of empathy, beginning by early adulthood and present in a variety of contexts, as indicated by five (or more) of the following:
Has a grandiose sense of self-importance (e.g., exaggerates achievements and talents, expects to be recognized as superior without commensurate achievements)
Is preoccupied with fantasies of unlimited success, power, brilliance, beauty, or ideal love
Believes that he or she is "special" and unique and can only be understood by, or should associate with, other special or high-status people (or institutions)
Requires excessive admiration
Has a sense of entitlement, i.e., unreasonable expectations of especially favorable treatment or automatic compliance with his or her expectations
Is interpersonally exploitative, i.e., takes advantage of others to achieve his or her own ends
Lacks empathy: is unwilling to recognize or identify with the feelings and needs of others
Is often envious of others or believes others are envious of him or her
Shows arrogant, haughty behaviors or attitudes
All that I've listed in bold, are what people with NPD have. The ones not in bold, are found in both NPD and AS. This isn't something you'll find in someone with JUST AS.
People with NPD see other's as tools, instruments, not people and friends. This is from experience with an NPD I met anyway. He would always pretend he cared for me and asked me questions about what's going on with my life, because he would then want to use me for something. It didn't work. 
Last edited by MightyMorphin on 23 Jul 2012, 7:17 am, edited 2 times in total.