I have a friend and we get along fabulously and mutually appreciate one another. I thought she was INFP then ENFP and it turns out she is ENTP. She has very well developed Fe. She's actually a yoga instructor.
If you are an ENTP with well developed Fe, you very well may be confused for an ENTP. Just like if you are an ENFP with well developed Ti/Te you may get confused for an ENTP? I know, you can grumble about that in the NT personal threads.
For me, I think Fe makes the difference in making an ENTP bearable to unbearable to enjoyable to be around. Fe takes the edge off being so self-absorbed and graceless and needing to one up people. (Yes, I have met ENTPs IRL like this)
Unlike Fi, Fe is much more easily understood and received socially and is much more group minded (i.e. 'less sensitive' or unpredictable), so an ENTP with well developed Fe could very well maneuver much more easily in public spaces than an ENFP with well developed Fi.
I know, it makes me grumble in the NF personal threads, too.