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Athenian is on point. The two systems are only similar in that Keirsey used the four letter codes to introduce his types. However, I was skimming "Gifts Differing" several days ago and was reminded why I eventually went to the source in reading Jung. It was Meyers-Briggs who first introduced dichotomies in her book, referring to differences in E/I, S/N, etc. She eventually discusses each type by dominant cognitive preferences.

Ezra you're correct that essentially I could resonate more with a temperament different than my own. However Berens (a student of Keirsey) has made leaps and bounds on defining Improvisers (SP) better, which makes it easier to relate. Now if I read PUM II, I can see the subtle differences in SP and NT.