Asatru and the Vanir

I was recently speaking to someone who defines himself as Asatru. I, on the other hand, just call myself a Norse Pagan. I understand the Asatru worship the Aesir exclusively…but the only Vanir gods we know of is Njord, Freyr, and Freyja. He said that he also worships them because they were accepted into the Aesir pantheon. So what makes Asatru different from being Norse Pagan if we are essentially worshipping the same gods?