You can duplicate widgets between slides or decks using copy and paste:
Option 1: Using the Right-Click Menu
Right-click the widget and select Copy
Navigate to the target slide or deck
Press CMD + V (or CTRL + V on Windows) to paste
Drag the widget to reposition as needed
Option 2: Using Keyboard Shortcuts
Select the widget
Press CMD + C (or CTRL + C on Windows) to copy
Navigate to the desired slide or deck
Press CMD + V (or CTRL + V) to paste
Drag to reposition if needed