Metaphysical Blinders
I'm unsure of specific examples but I wanted to name the concept first. I find that a lot of things in the world are talking about the same fundamental reality but in different, flavoured vocabulary.
The "spine" and the core of a lot of seemingly separate traditions of thought is the exact same. Yet, people often are surprised when they hear the same concept but with a slight variation. As if it is totally new.
I think this has to do with the way we have structured the data in our brains, where we have gotten too used to not only compartmentalizing everything - which is a normal brain function - but to keep said compartments as if they are totally separate.