watch tower resued passwords how do i see what other accounts are using the same password??

So is there a way to see which accounts are using the same passwords in the browser? I'm in a similar situation to billyman in that sometimes the same account is accessed through separate domains. I'm aware I can add multiple domains to a single entry, but first I need to figure out which separate entries are using the same password. It isn't always obvious, because sometimes a website uses a third-party vendor for certain things so the two entries may look completely unrelated.