Hi! You can just copy paste components. Put everything you want to copy in a container, select it, press cmd/ctrl+c, open the page in the app you want to paste to and press cmd/ctrl+v.
Please correct me if I’m wrong, but publishing them to marketplace doesn’t make them public unless you have the unique ID and search for it. I have some datasources for Firebase actions (registration etc.) in the marketplace where I use them across apps.