Reverting DB to older version

I have found that I only have the database backed up from my pre-wp 3.5 upgrade. I need to revert back to WP 3.4.2 because my theme is not working with the upgrade. If I upload my old database file to my site using cpanel, will it revert my wordpress version to 3.4.2?

I dont’ care if all my recent changes show up, just that my template works.

Thanks.