The test aren't all that accurate in determining one's mbti type. Also, nobody will posses 100% of any type's traits. A more efficient way of identifying your main type is to thoroughly study the eight cognitive functions. For a very simplified description of them, look for my post here (ignore the irrelevant info):
https://answers.yahoo.com/question/index?qid=20141015142032AA2ra9O
ENFP: Dominant Ne, Auxiliary Fi, Tertiary Te, Inferior Si
ENTP: Dominant Ne, Auxiliary Ti, Tertiary Fe, Inferior Si
Extroverted intuition dominants ENTP and ENFP live in a world of possibilities, ideas, concepts, abstractions, and theories.
Stereotypically speaking...
Both the ENFP and ENTP see what is objectively missing at any given moment, giving them a quick, intellectual wit (dominant Ne). They are open to new ideas and innovations, looking at the potentials of the world. They utilize their minds to explore the unknown possibilities. However, since they have difficulty in getting in touch with their map of the sensory, tangible aspects of the past, they are scatter-brained, ditzy, and absent-minded at times (inferior Si). They are prone to losing objects and are forgetful.
As for the differences, the ENFP has a better awareness and understanding of his own morals and values (auxiliary Fi). He readily identifies his position on what is right and wrong, good and evil, etc. In forming value judgments of people, he can see past the societal, logistical protocol for behavior. The ENTP is more adept at troubleshooting and breaking concepts apart using process-oriented logic, enabling him to be proficient at debating, coming in at angles that are unexpected by his opponents (auxiliary Ti). The ENFP has a bit of a hard time executing logical, procedural decisions when needed, making him somewhat ineffective when it comes to getting responsibilities done and reaching goals (tertiary Te). He is not always cognizant of the tried-and-true, time-honored advice (plural) based on logic that have been consistently been proven to work. The ENTP has some trouble with being aware the emotional under tones of a social environment and adapting to them, occasionally seeming overly rational, dryly detached, and robotically cold (tertiary Fe).