yeah, i'm not sure if it's just function matching, but i've found INTJs more open minded than INTPs. it's like INTPs can't see outside of Ti, while the Ni of the INTJ allows them to troubleshoot different possibilities before scoffing at them. of course, it takes a willingness to be open to a possibility, which i've seen plenty of INTJs simply not entertain because whatever's been put forward just seems wrong to them.
I'm not as open-minded as xNFPs (they can get pretty far out there) and ENTPs in general and I can see how thinking dominants could be seen as being less open, but I'm usually light years ahead of xNTJs. When I'm closed off it's because I'm tired, am in the middle of something else, am trying to figure things out for myself and am being interrupted, or I'm not open to the crap some idiot is trying to force down my throat (I think the person is stupid and that they don't know what they are talking about). I'm not open-minded to stupidity. There are also cases where I'm not close-minded, but someone repeatedly says I am, so therefore in the minds of everyone else, that's exactly who I am.
Maybe INTJs are quietly more open-minded, but the display they put on usually makes me think they are backward, stupid, instantly get stuck on something being "right," don't really think much before they reach their conclusions (it's as though they pick something, mumble some BS for a while to make it seem as though they are deliberating, then go with the arbitrary decision they made as they try to find some facts to back it up), and are always trying to force it on others as though it's clearly the way things should be. Yes, INTJs are capable of changing their minds, but it's as though someone has to spell everything out for them, assault them in an argument, let them move on without having to admit they were wrong, then let them be able to take this new learning and shove it down everyone's throat. And even past the fact that they didn't admit to being wrong and are still forcing some opinion on others, they don't seem to properly understand what was communicated, or they twist it around until they are saying something else, or something inline with what they were saying before (while continuing to try to say they were right). The extremity of this isn't as severe as with guardians (xSTJs, especially), but it's always there and it gets on my nerves. It makes it impossible for me to be around types like these. They are always on in this regard.
Maybe INTJs are more open-minded to emotion-related things than INTPs, but I'm not sure. That is, INTJs seem to draw a complete blank when it comes to emotion-driven things (versus the INTP who just mostly draws a blank), and I've seen them open themselves up to and accept some of the dumbest explanations and rationalizations in this arena, something I would never do. Usually people reacting emotionally isn't them reacting emotionally, usually it's them being stupid or full of it, and they need to let it go. When it comes to the emotions of others, I often end up thinking INTJs are nuts and stupid for some of the things they agree to. Maybe that's not them being open-minded, maybe they are showing their irrationality and how they'll jump around doing random things in order to feign competence, not have to admit they're wrong, and not have to acknowledge their ignorance or stupidity in a certain area.
Sometimes I wonder if I'm actually open-minded or if it's that I don't care what people want to believe (or if it lines up with what I believe). It wouldn't be readily obvious that I'm closed off on an issue and am not open to changing my opinion, because I'd still have no problems listening to other points of view, can see how someone could arrive at those beliefs, and can even argue as though I agree with what they are saying.
I don't always see it as necessary to change my point of view, even if it seems I'm wrong. This isn't usually as obvious as with judger types, because I'm not forceful with what I think, I'm not trying to impose my beliefs on anyone, and I don't go around broadcasting what I think as though it's the official and final word from on high that everyone should clearly listen to, because I've made a decision.