In order to determine whether it is possible to update your existing app with a new app, specific information from both stores is required.
A Store Update is an update for which a newer version of the code has to be submitted.
You have control over the developer name that is shown in the app stores.
It protects your account by requiring a password and access to either a trusted device or verification code delivered via SMS or phone call.
An Apple Enterprise Developer account is what you’ll need in order to distribute internal apps for your company