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 and click on magnifying glass icon to see the preview,

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

Now, switch to another account and open templates section or the Design step when creating a campaign,

Import the campaign using Import from URL option,

Paste the URL and click on Import URL,

Finally, click on Save changes.

You can also check support article about Sharing Templates Between Accounts.