Using the same campaign template in several accounts can be very useful. You can easily copy a campaign from one account and save it in another.

Steps to copy a campaign to another account:

• Open campaigns section 
• Click on magnifying glass icon to see the preview

• Click on the archive link icon and copy the URL of the campaign

• Switch to another account
• Open templates section or the Design step when creating a campaign
• Import the campaign using Import from URL option

• Paste the URL
• Click on Import URL
• Save changes

You can also check Sharing Templates Between Accounts