Are the templates fully compatible with Drupal, Joomla or WordPress?
Yes, the templates provided by http://yoctotemplates.com/ are fully compatible with the WordPress, Joomla and Drupal. For each CMS, it has specific templates and extensions. The stuff provided here are fully tested and you can find your required one here and the coolest thing is you don’t have to pay anything for that. It means all the stuffs are provided for free to the users.
If you are planning a site migration and have not figured out how to do it the first time, I advise you to simply choose good specialists for this task. Everything will be done for you and better, you can find more information here https://anyforsoft.com/technology/drupal-9-upgrade-and-migration-services/