Hi Tricia,
When a vendor registers on the Pro Dashboard page (/dashboard/) that is WC Vendors. When a customer registers on /my-account/ that is WooCommerce. Otherwise, it’s WordPress or something else. 🙂 Confusing it can be, indeed!
You can add extra fields to your vendor application page by WCVendors.com > KnowledgeBase > Custom fields to settings or product pages, and then add them to the vendor application template.