Yes. Look at the .sql you loaded. And for every line in that .sql file, note the table it's inserting into. Find that table, and remove the specified record. Be sure to delete the newest record ONLY. Because if you delete the older (smaller id number) record then you'll break customer/order records that link to that older record, causing you messes all over the place.
This is the sort of thing a skilled db administrator should do.
ALWAYS MAKE COMPLETE TESTED BACKUPS BEFORE DOING ANY DIRECT DATABASE MANIPULATION!!!!!!!!!
... You DO make backups, right?
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