@CClark3 our app Koalify will do exactly that to identify potential duplicates 
You can create a rule that will highlight deals with the same “Project ID”.
These will be marked with our Koalify Properties. One of them is the number of duplicates.
Which is essentiall the number of times that Project ID is found.
You can use it for free if you are not merging.
This is how it looks like for companies with the same “Custom ID”:
Hope this helps!
