They are what? E4's? If you say so.
I'm not sure what you want people to do here.
Do you think someone who identifies with ENFP and INTJ descriptions are also ENFp's and INTj's? If you do then we can talk about the same thing in regards to what enneatype they would be, if you think they are not then I can't comment on what enneatypes these people might be at present.
I also thought your primary concern here was your ISFp friend, but now you are talking about all the types..on MBTT? We would need more data than what at the moment is a subjective typing of either two people or a group of people on more than one system. How were they typed? Is it valid? Are you with me?
Edit: I see you've edited your post, but I think what I say above still stands. Although i'll develop on a question..why doesn't ENFp = ENFP?