The Login Data file is where your passwords are at. But, it's not a CSV file. The password importer only supports CSV files.
Since you don't have a CSV file, you would copy over the "Local State" and "Login Data" files from your old install choosing to overwrite the new ones. However, this probably won't work in your case because the Login Data file is encrypted based on your Windows account credentials and those have changed with your reinstall of Windows. You can try, but you're probably out of luck.