It's the P/J which you want resolution on, so I assume the INT is definite for you, and will focus on that last letter:
because spontaneity is our game, we dislike routine, dislike schedules. Very often, weak in follow through, and have problems with deadlines. In fact, i hate deadlines. I much prefer to work as and when; when the ideas come. And it flows. Deadlines to me are something that are best ignored. Alternatively, they provide the spurt for last minute inspiration, which is where the INTP works best under.
An INTP in that sense works best in spurts; whereas, an INTJ would work best methodically and consistently.
INTPs under stress get very, very hyper and energetic. It's the Ne going wild. You'd start seeing all sorts of (crazy) possibilities, want to do all sorts of crazy things. Feels like you're a trapped bird beating its wings against the cage.
Yet an INTP rarely, if ever, holds malice. Even if a wrong has been done to you, the natural instinct is not for revenge, but to walk out, to get out of it. In that sense, an INTP is more conflict avoidant than an INTJ: an INTJ is more likely to go head on. (perhaps an INTJ could weigh in here)
INTPs in conflict and in stress mode tend to fall apart. We don't do stress very well, unfortunately. INTJs under stress will likely get even stricter with themselves, and impose absolute control on themselves and their environment. THey get colder. An INTP meanwhile, does the classic implode-til-you-explode scenario. An INTJ would bury it within, likely. and dissociate from all emotion.
INTPs are also naturally more open and inclusive: because of the NP connection. The natural urge is to go out, to learn things, to get to know things. It is to play. The best explanation of an intp when facing new things:
THe world in that sense exists as a playground and a toy.
Whereas for the INTJ, the world exists as something to be controlled; to be changed, according to their vision.
An INTP seeks to take from the world what will help them within; occasionally, we may try to put an order to the world. But rarely, if ever, do we want to control others, or insist that things have to be *my* way. Because the aim of an INTP is to tinker with the system, to play with it, and to leave it. There's seldom any urge to impose direct control. It's the urge to understand, to figure out the flaws, and the possibilities. But not necesarily to implement.
The INTJ, on the other hand, because of Te, seeks to impose his order on the world. ie, the INTJ is keen on implementation; the INTP is keen on figuring out the process, and playing. He's not so much bothered about whether his ideas are implemented or not.
Also, INTPs are generally warmer than INTJs. innocent in affection; if they take to people, they take to them, if not, they don't. THere's seldom any hiding, or concealing of emotions. Mostly, they're at emotional games. An INTJ is too, but will methodically seek to pwn the game. INTPs will tell you straight out if they like you; it can be on a whimsy such as you like butterflies as much as they do. An INTJ is more likely to be circumspect, and do a cost-benefit analysis to decide if they should like you or not. If the benefits outweigh the costs, they'll choose to like you.
INTPs make conclusions fast, but are always willing to rework and change it. Because they are absolute in the moment, but subjective in the entire span of time: ie, they acknowledge possibilities and perspectives. INTJs rarely make conclusions, because it's all a *work in progress*, but once they do so, they are definite: ie, only one view.
Basically, under normal mode, an INTP is or . In stress mode, an INTP is
Under normal mode, an INTJ is or . Under stress (or even normal mode) an INTJ is
Which resonates more?
(note, as i'm an intp, other *possibilities* are always possible. so i'll leave the floor open for debate now. )