You will have to rebuild the interface. Currently there is no tool to do that for you.
If you click on the 3 dots app in the Glide dashboard, you can build a new app from data. This will retain all computed columns. But yes, multiple apps can refer to the same data. Just make sure you select to keep the same sheet, so your tables aren’t duplicated.
The Glide branded url is different. (glideapp.io vs glide.page). But, if you use a custom domain, you should be able to transfer that domain to the new app.