I don't think that the issue is that they are similar, but they are blended and depended on each other.
won't take part in the creative's role, and
isn't a part of leading (unless we go through a separate topic of discourse I tried to bring up in silverchris' thread, but I don't think it'll ever start up again), so I can understand as a beginner this is difficult, but I feel like too much time is spent trying to wean away bad early habits to learn Socionics that you might as well start teaching from the beginning what we can all agree on as being a right way to type, I don't think anyone can argue typing by IEs and function placements being a bad way to type. Obviously its hard when you don't understand these elements, but that applies to every other thing you have to learn in life.
If we seem to have conflicting ideas that clash because of the differing models we look at, sorry, I'm relatively unschooled in Model B, and I hope you don't bring it to our conversations only because I don't know enough to see its influence and where there could be miscommunication because of us looking at different models. I don't think
are similar, they are actually radically different, especially when you observe them in the other quadras, you might feel this way being the type you are? I don't know, our perspectives might be clashing because I can view the IEs as very distinct from one another, and then blocked together, while you might see them inherently mixed together and unintelligible within the block, which is an idea that deserves more exploration. People may apply it but not with the depth it needs.