We have a duplicate TITLE checker tool that we run once a week to make sure no duplicate articles slipped by us with the same TITLE name by the same AUTHOR.
(But, we do allow SAME TITLE articles by different authors.)
Out of 10K articles, we had about 25 duplicates, 14 or so that were legitimate.
ARTICLE TRIVIA: The article TITLE that was most used by 4 different authors was “What’s in a Name?”
So, as you go about creating articles for your business, perhaps you won’t use “What’s in a Name?” for your next article title. :-)