Going by this question, there once was a time when what we now know as duplicate questions were called exact duplicates. Fortunately, this has been changed with exceptions to the tags on Meta SE and some site metas that have analogous tags. This is confusing as the scope of this tag covers all duplicates and not only exact ones.
To add to the confusion, there are questions which actually are about something that would deserve the name exact duplicate.
If such a renaming gets performed, this should also be applied to site metas which follow the main meta’s tag names – unless there is some site meta which uses exact-duplicates intuitively.