INTJ: Ni, Te, Fi, Se
INTP: Ti, Ne, Si, Fe
The two can appear similar outwardly because: they both prefer logic and abstract ideas/theories. This is, in my opinion, where the similarities end.
It can be easy to mistype in personality tests because a lot of those are dichotomy based, so it’s definitely easy to mistype as either. In terms of functions, I can see how Ni-Te and Ti-Ne can be confused. They both like abstract ideas and logic (as I said above). The difference, I think, lies in this combo if you dig a little deeper.
First: Ni vs. Ne.
Ni tends to be more sure of itself than Ne. Ni likes to converge onto a single truth, while Ne likes to diverge into a number of possible truths. Ne tends to be flighty, going from topic to topic or idea to idea. Ni tends to stick to one thing. Ne is constantly changing. Ni may have a very specific idea of what it wants (however abstract that idea may be).
Ni says “this is true.” Ne says “this could be true, but so could a number of other truths. let me ask someone else and have an interesting conversation about it.”
Now: Ti vs. Te.
Aux-Te (INTJ) has the ability to implement their ideas. They’re good at organizing/planning. They value hard work. May be seen as blunt/direct.
Ti doms (INTP) like logical consistencies and like figuring out how things work. They don’t need to project their logic outward like Te, they’re happy doing it all in their head. They don’t need external organization.
The difference between Ni-Te and Ti-Ne is that Ni-Te has the work ethic and patience to turn their ideas into a reality. Once Ti-Ne knows how something will end, it’s bored and moves on to the next topic. This is why INTJ’s may see INTP’s as unable to implement their plans or find practical applications for their ideas.
Do I get along with INTJ’s:
I have the potential to get along with them if they’re not assholes. Their decisiveness can intimidate me sometimes. I also don’t like how much of a stickler they are (things always have to be done their way). Other than that, yes, I tend to get along with their fairly well.