When I taught CCD many years ago I would discuss both enumerations, Catholic as well as Protestant, wondering if something like this would actually occur. I was concerned my students would see the Protestant enumeration somewhere on the schoolhouse wall and wonder why they were taught something different. This is prima facie why the commandments should not be displayed because it separates denominations as well as entire faith traditions and emphasizes differences, not commonality. This feeds into our tribalism and is one of the reasons we are not seeing each other as equal citizens.