You can copy and paste your elements by using these keyboard shortcuts:

To copy:

Windows: Ctrl + C

MacBook: CMD + C

To paste:

Windows: Ctrl + V

MacBook: CMD + V

When you copy an element from one scene to the other it will be pasted in the same position with the same properties 😊

Note: You won't be able to paste an element in a different project, only in the same project across scenes.