ENFPs are far more excitable, enthusiastic, reactive and impulsive. They give off an aura of cheerful energy. INFPs tend to give off an aura of meekness and gentleness (a deception, I assure you) and are more approachable to those in need of sympathy. They're capable of being crazy and silly, but it isn't their default in the way it is for ENFPs.
I agree that INFPs are somewhat more emotional, but they are far less demonstrative of it. From what I've seen, a hurt INFP is very slow to approach the one who hurt them (if ever). ENFPs tend to confront the person as soon as they realize they're hurt. I'll bet INFPs are more aware of their emotions as well. (This may not be a typical ENFP phenomenon, but I'm typically blindsided by the more intense emotions... I don't know what I'm feeling half the time.)