You can make available the CustomShows created in one account easily for use in another account. 

You can import CustomShow from one tenant to another by uploading a downloaded CustomShow or through copy link which is an easy and faster way to make a CustomShow available on a different tenant.

When you download any CustomShow, you will see the list of the fonts used in that CustomShow.

You will have to download the fonts from CustomShow Editor File>Fonts>Download Fonts and upload the fonts in the other tenant where you want to upload the CustomShow. 

If you do not upload the fonts used in the CustomShow, it will show you conversion error.

You can check the available narrative to see the steps for exporting and importing CustomShows.