Saved searches in the form of source templates is something our team is working on. However, a workaround for now would be to alter the search parameters within the same table, import the new companies found, then create a filter to only show the new companies that were just created.
While these won't be in separate tables they will be in separate views. If you'd like them to be in separate tables you could then write all of this data into a new table.
Hope this helps! Let me know if you'd like a hand setting this up. :)