Were both The Haunted World of El Superbeasto and Mary and Max both  based on comic book series? 
The Haunted World of El Superbeasto:  The film was written by Zombie and Tom Papa from Zombie's comic book series of the same name. Mary and Max: Mary and Max is a 2009 Australian stop motion animated comedy-drama film written and directed by Adam Elliot as his first animated feature film with music by Dale Cornelius and produced by Melanie Coombs and Melodrama Pictures.
from Zombie's comic book series