Pro Sites Post/Page Quotas "Same as Pages" Clarification

On the Pro Sites Post/Page Quotas settings section I have a custom post type that has a greyed out drop down menu that says "Same as Pages".

I'm wondering what this "Same as Pages" means. If I set Pages (regular WP style pages) to a max of 10, does this mean that a total of 10 WP pages and custom post type pages can be created? Or does it mean that 10 WP pages and 10 custom post type pages can be created (total 20)?

I suppose this question goes for Posts and Media quotas as well.