Hi there,
If you are using the normal header of the Pro and not the header built with Header Builder, then you need to use this file for your customization:
wp-content/themes/pro/framework/legacy/cranium/headers/views/global/_brand.php
But if you are already using the Header Builder, then just duplicate the header and change the image of the logo and assign the header to the pages you are interested in.
For more information about the Pro Header Builder:
Thank you.