It also counts when the actors/ voice actors from a film/ TV show make a return in an unrelated sequel, when their show/ film character is on another, or when the TV show is made into a film (or vice versa) and roles are reprised.
Examples of this is when Jim's dad manages to make it into yet another American Pie film - and it still makes sense. Or Patrick Swayze as the instructor in Havana Nights. Then, when in Family Guy Season 7 the cast of 'How I Met Your Mother' is ordered to be killed, and theactors from HIMYM play their characters from the other show.
In cases like these, the trope would be of the second show.
In one Marvel Avengers comic book, Nick Fury asks that if they ever make a film about S.H.I.E.L.D and the Avenges that he be played by Samuel L. Jackson, which he is. (Marvel had previously exchanged likeness rights for Fury in the modern comics with Samuel L. Jackson for the role of Fury in the films.)