There's no such thing as a T/F conflict.
In a case like INTP vs INFP, it's going to be similar to the problems that an INTP will have with an INTJ.
Fi-Te says "things are this way and I'm right about that, and furthermore it doesn't matter what you think... maybe it can, but only if I like you...a lot" (INFP/INTJ/ENFP/ENTJ)
For NF types who are Fi dom/aux, you might add "it upsets me that you don't agree with me." Disagreeing with an opinion of an Fi dom/aux might be taken as a personal insult. With a Te dom/aux, you're going to run into more of a wall, "I'm right. The end. Not listening. Don't care."
Fe-Ti says "regardless of how things are, who is right or who is wrong, we should be able to discuss this amicably, and be able to give credence to any potentially valid points and honestly listen to the other person's opinion. How I personally feel about you doesn't matter as long as you make sense/your logic is sound (though chances are if you make sense, I like you)." (INTP/INFJ/ENTP/ENFJ)
Fe dom/aux might stop arguing for the sake of keeping the peace. Ti dom/aux might stop arguing if they get too frustrated, but are likely to argue for longer because Ti wants to get to the bottom of it, and is going to want to explain how and why the other person is wrong until the other person understands (and presumably alters their opinion).
Fi-Te people may see Fe-Ti people as "wishy-washy", because Fe-Ti people can change their minds when new information comes to light and may back off when they're too frustrated, which Fi-Te people might see as a lack of conviction.
Fe-Ti people may find Fi-Te people overly stubborn and exhibiting "willful ignorance" particularly if the individual cannot be swayed by evidence and logic. They may also find this combination makes the other person appear arrogant and contrary. Refusal to consider their points may be seen as an insult, a disrespect to their competence or intellect.
For an INTJ, Ni is going to back up that Fi-Te. Te is going to find the practical functionality to be more important, "this information I've accepted as correct has held true through my experience, and that's enough for me. I don't need to delve deeper or alter it."
For the INFP, you're going to initially have a bit more leeway. Their Ne is going give them a breadth of possibility consideration and their dislike/fear of criticism might push them to be more considerate. HOWEVER, once the INFP has chosen one option/position and infused it with Fi value; cnce it's been integrated and projected into their daily life via Te- Ne won't matter anymore, and Fe-Ti pleas of harmony and rationality aren't going sway them.
Genuine arguments between people with Fe-Ti and Fi-Te are very difficult to navigate through and have both parties come out the other side amicable and OK. There's probably a cool-down time before normal friendship/relationship activities can resume (if they can). But this is the difference that's difficult between INFP and INTP, and it's not an F/T thing.This issue will occur between two Fs and two Ts just as easily as between one F and one T.
As a further addendum I want to add
* friendships, particularly cerebral ones between two Ntuitives are much easier to maintain despite these differences. closer personal relationships are more difficult. It's mostly fun and games when we're simply exploring ideas and projects.
*INTPs in particular might be viewed as confrontational and inconsiderate by people with Fi, because they won't have as much emotional investment in an idea as an Fi user might. They won't always realize or understand why an Fi user holds something as axiomatic and the kind of personal distress that trying to change that can bring on in that individual.
*The more developed and mature the individual, the easier these things are going to be. When under a lot of stress or very inexperienced and/or hormonal every type goes to a bad bad place. Unfortunately, the world is quite unkind to Introverted Intuitives of both the Fi-Te and Fe-Ti flavor, we tend to develop and mature more slowly than other types. Yet like fine wines or cheeses, we're definitely worth the wait.