When I think of similar MBTI types I myself thinking of the iNtuitives grouped like this:
ENFPs & ENFJs
INFPs & INFJs
ENTPs & INTPs
ENTJs & INTJs
In other words, I group the E/I NFs together and the J/P NTs together. I find an ENFP is more similar to the ENFJs rather than the INFPs.
Anyone else do this? Or perhaps with other types?