Replacement of new app with an existing app on the app store

Hi team,

On the app store connect we have two applications. One of the applications is old and is under production and is been used by the users. Another one is developed recently and we have got approval from Apple to release the app.

Both the application have a different bundle and apple id, along with different names.

Now we want to replace the old application which is available on the app store with a new app. How can we achieve the following?