Hey Sebastian,
Thank you for reaching out to us!
The Tickets Email template is the same for both RSVPs and Tickets purchased via your e-commerce. You can customize it with a template override or by using the filters we have available. The original template for the email is on:
event-tickets/src/views/tickets/email.php
This file is included by the generate_tickets_email_content method on event-tickets/src/Tribe/Tickets.php
You can override this template in your own theme by creating a file at [your-theme]/tribe-events/tickets/email.php
You can use our Themer’s guide for more info > https://theeventscalendar.com/knowledgebase/themers-guide/
I hope this helps! If you have any other questions at all please feel free to let me know and I’d be happy to help as best I can!
Cheers,
Patricia