... so not the same.
The energy level and sheer randomness of both can confuse outsiders, especially if they're well-adjusted and balanced, but there's a fundamentally ruthless/pragmatic streak in ENTPs that ENFPs lack. The Thinker side of them cares more about ideas than relationships and thus can muster a much more "testing"/sarcastic edge than the more open and friendly ENFP wants. This doesn't mean that ENFPs can't be mean, because they can cut deep when pushed, but fundamentally it's a reaction mechanism.
I'm not sure I agree with this. ENFP's Fi gives them a highly individualized set of values and ethics which I've known my ENFP brother to use to enable him to feel justified in doing many a shady deed that I'd never even consider.
I could equally argue, thinking of differences between my brother and I, that it's often almost the complete opposite way round, his F making his own happiness/emotional comfort more important to him than my T, which makes my own emotional state irrelevant to me. So he's FAR more likely to fuck someone off with the kind of reasoning that says after the event "I just had to do that, for me", the sort of thing I'd never really be caught dead even thinking let alone saying. I'm WAY more dutiful than he is by a long, long, long way and he's a hell of a lot flakier than I am.
I'd say on a scale of 1 to 10 our mental health is probably about the same, around 7 or 8 which I reckon is around average for most people of our ages.
My T-based sense of honour that comes from detached sorta intellectual analysis will hold me back from doing an awful lot of things that his individualized value system will allow him to do without shame.
I don't mean to say by this that ENTP's are kind, honourable folks whilst ENFP's are selfish Machiavellians. I mean to say we can both be a bit of both, but the reasoning behind it is very different, behind why we would or wouldn't do or say something.
I'm afraid that if pushed to explain what I thought the difference was that enables one to tell ENTP's and ENFP's apart, I'd say that I can't really explain it. But I recognize it when I see it. Intuitively
Oh, and by the way, I've NEVER wanted to "create an empire and conquer the world". I think that's the ENTJ stereotype, n'est-ce pas? I couldn't give a rat's ass for power or control or achievement in that sense. But I have in the past been closely intertwined with xNTJ's that
do, not because I want the power, but because I'm very happy to let them struggle for all that excellence and achievement and all the responsibility that goes with it, and ride along with them because their struggle produces so many exciting challenges, obstacles, set-backs and stuff that it keeps me sharp, entertained and engaged to put my mind to solving their problems and finding ways for them to do what they want to do.
P's - it's all about the method, the gameplay, the strategy. Not the result.