You can set Logo and Footer as Default for all email templates.
With this option, your custom design and content of the Logo and Footer block will be applied to all other templates so that you don't have to do it over again.
Set Logo or Footer as default for all email templates
For the Heading block, you can also set it as default to clone the design of Heading to other email templates. Note that only the design is applied, the specific text of Heading block in each email template remains the same.