How to replace reactnative existed ios app with newly created reactnative ipa

Question

actually i have old RN-IOS project 0.59,I tried to upgrade react-native IOS project because of environment issues i had to created new react native project and copied all files and run the application as separate project , and i tested through test flight as separate app in app store but now i have to update the old app which was developed 0.59 app with this newly created react native project app , what are required to update the old app ,i am new to this development.