Can be done; I do this regularly.
Make a careful note of the exact names of the .dbx files that you have backed up. Each File represents a Folder in OE.
Open OE, and as well as the default folders such as Inbox, Outbox, Deleted Items etc, create new folders with the exact names of the files you backed up (without the .dbx bit obviously).
Then - this is the critical bit - open each of the new folders in OE. They will all be empty, but this action creates files of the same name in the Identity folder you described.
Then, using Windows Explorer, copy your backed up .dbx files over the new unused files. In each case you will be asked the usual question, "Do you want to replace the existing ..." and you will answer "yes".
No harm in copying Folders.dbx as well and pop3iudl.dbx and pop3.log as well. The pop3 files contain information about the e-mails you already have. If you copy them over, you will avoid downloading a lot of duplicate e-mails you already have.
Next time you open OE you should see all your e-mails.
If it doesn't work, get back to me. I have probably not explained something clearly enough.