I want to release new version of app under another developer acc. But i want to have possibility to share icloud data between old version of app and new (under another developer acc).
Apps must be part of the same team in order to have entitlements allowing them to share data. If you want to move an app from one team to another, you can transfer the app. Details can be found here: https://developer.apple.com/library/content/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/Chapters/TransferringAndDeletingApps.html