It is a tough question, but I think I feel more in common with other FPs. I don't know many NFJs in real life (I cannot recall knowing anyone), but other FPs, and I have at least something in common with them always. Here on the forums I know also NFJs, and while I can agree with some on some things, the similarities seem to be more with FPs still.
edit: I understood it so that either I have to choose ISFP, ESFP, INFP, ENFP vs INFJ, ENFJ. Obviously though I would have more in common with people of same type, so it would be a strange question, so I imagined that same type is excluded.