I am an INTP in MBTI and socionics. It says that to find your MBTI type from socionics, you have to reverse the last letter of your coding. Is anyone else here the same type in both systems and is an introvert?
MBTI and Socionics type correlations are all over the place. For the functions to line up "as expected" in Socionics, a MBTI introvert would flip the last letter.
But the functions have different definitions in Socionics, so this isn't a cut-and-dry method. Sensing is especially different, with internal physical states belonging to Si and Se being about acquisition and influence. Intuition seems to have more of a MBTI Ne flavor overall, too. (I'm not sure about the others, and I'd love to hear about them.)
It's also purported that a MBTI INTP and a Socionics INTp actually describe the same type, just that the function order is in disagreement between the two systems.
Despite this, the online tests are about the same as in MBTI--mostly dichotomy based. Socionics relies on functions much more than MBTI, so dichotomy tests are even more inaccurate than MBTI's
As an example of how this plays out, I'm ENTp in Socionics and ENTP/ENFP in MBTI, and my INFP is a Socionics ISFp.
No, there is no reason why you should flip the last letters. The functions are switched, but they are defined and described in different ways, so a combination of Ti-Ne in MBTI can be roughly equal (in behavior) to a combination of Ni-Te in socionics. In any case, there is no real clear-cut correlation, even though I personally believe that for most people most letters remain the same.