Migrating v3 to v4 mobile app changes?

Hello, we are in the process of migrating from v3 to v4.  We have a mobile app that is released in the App store and Google Play store.  Are there any changes that we would have to make to the mobile app?  Both apps in the stores are pointed towards our production environment.  Would we have to upload a new version into the app stores?  I believe that since our URL of our application in v4 will be the same as it is in v3, we would not have to build a new version of the mobile app and upload it into the app stores, I would just like to confirm this.  Has anyone else went through this process?  Thank you. 
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