If so – you can pull a search term report segmented by keyword and see whats overlapping
Unfortunately due to how Google “matches” terms to keywords, even removing the same words from different keywords won’t guarantee no overlap – so worth pulling that report after you go live as well if you haven’t yet!
Quick note besides this, keywords within account will never bid against each other.
The way how it is determined which keyword joins the auction is based on which one has the highest quality score.
Removing duplicates helps reducing cluster but your cpc’s won’t decrease because of this. When you are on more broad match types and they are in the right ad groups, no need to remove duplicates either.