Well, Eric scores as INFJ, I score as INFP, Guy as INTP but there’s a lot of overlap there. I think of INFJ as ruminating a bit more and finds the disconnect between self and the world to be a greater burden than INFP or INTP; slightly more but enough to mean probably more pain in areas I never had to see in myself.
I think of INTP as being able to be a little more objective in the sense of being able to disconnect the subjective just a bit more than INFP or INFJ when needed;
I don’t know if these things are true or not; lots of people take these with a grain of salt and many discount them all together. But like other personality sorting tools, I think it has its place in helping put together a little shorthand for at least a few commonalities