Unfortunately, you cannot copy an existing widget within your report, but there is a way around it. 

NOTE: This is possible only when creating a widget, not when editing it later on. 

STEP 1: Create a desired widget and click on SUBMIT

STEP 2: Now that your widget has been created, you can create another one just like that by clicking on PREV and going back a step to select another source.

This way you can create exactly the same widget with another account.

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