Yes, the page name changed for Page B (Cards Page) after the new implementation. 

Page path views decreased by 50% from Page A to Page B after Page B was migrated to AEM. Before the migration, both Page A and Page B were in Drupal CMS. After the migration of Page B to AEM, path views from Page A to Page B decreased. See the screenshot below. 

The page is captured in the 'Page Not Found' metric when using the marketing channel to check the source. 'Session Refresh' shows high for the page that lands on a 404 error. The page is not deleted but is redirected to a 404 page.Screenshot below.