Any suggestions on how to quickly clean up duplicate passwords

Thanks for your reply, SteveU75 !

If you haven't already, you can view the items in both vaults together in a collection without merging the vaults themselves: Use collections to create custom groups of vaults

Once you've selected a collection, you can sort the listed items by title or date modified/created to help you identify which items might be duplicates or out of date:

From that list, you can double-click items to view them in a new window, this will make it easier to compare items side by side. Once items are up to date, you can drag them from the item list onto a tag to apply that tag, or drag them onto a vault in the sidebar to move them there. You can also hold Cmd or Shift on your keyboard to select multiple items.

Let us know if we can help with anything along the way. 🙂