I imported some donation records, using the nationbuilder_id field to tie the financial info to existing people records. I found today that NB created dublicate records instead of linking the financial information to existing people. So I have at least 1,000 dupes in my nation now. The dedup function is not catching them even though the names are all 100% identical. Does anybody know:

1) the proper way to "link" a financial import to existing people (email addresses instead of nationbuilder_id?)

2) Can I force the dedup function to look at last names or otherwise catch these people?