Replacing a page
Hey Dundee,
Did you check the permalinks of the two pages, you will have to completely delete the old page (from the trash) for the permalink to be available for a new page. If you want to make a copy of a page then you can enable debug mode in order to see builder shortcodes: http://kriesi.at/documentation/enfold/enable-advanced-layout-builder-debug/.
Best regards,
Rikard