Socionics interprets many of Jung's functions completely differently to MBTI. This means that although there are overlaps between corresponding types, there are also many differences and one cannot say that to be an ENTP is to be an ENTp. (And ENTp is perhaps the MOST like it's MBTI cousin out of all the types). If you look at the Sensing functions and Feeling functions, you see a drastic difference in interpretation, which combined with the differences in opinion on I/E and J/P proved two different frameworks.