Trello recently introduced a new feature called board and card templates. Don't get confused, they are not related to the Processes for Trello Power-Up and work in a different way.
Trello's board templates provide a predefined list structure, which can be applied to newly created boards, so you don't have to start from scratch. Processes for Trello is flexible enough to work with any structure, be it from a Trello template or your own, battle-proven structure.
Trello's card templates are single, copyable cards for your most common tasks, which allow to predefine certain card fields and duplicate them on demand. Processes for Trello's process templates are way more powerful. Instead of single cards, they allow you to predefine whole sets of temporarily ordered tasks (cards), which you can duplicate and link to a parent card with only two clicks.