I often work on multiple app versions and was getting tired of copying every single object from one application to another so I developed a small extension that can be used to copy a sheet with all its objects.
Just drag it to the app you want to paste the sheet to, select a source application / sheet and click "Copy & Paste". The sheet will be appended to the end of the current sheet list.
It may contain bugs. Feel free to modify the extension to your needs.