Hi Diego! 👋
This is already possible — just from the destination card, not the source one.
Open the card where you want to add the checklist - click Checklist - find the "Copy items from..." dropdown - select the checklist you want to copy from another card.
https://support.atlassian.com/trello/docs/copying-cards-lists-or-boards/
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.