- Both have black hair
- Both are/were in love with Francesca
- Both dislike Ludmila
- Both appeared in season 2 of Violetta.
- Both can play the guitar.
- Diego has spoken to Ludmila many times, whilst Marco has not.
- Diego lives in Buenos Aires but Marco lives in London.
- Diego is Francesca's boyfriend, but Marco is her ex-boyfriend.
- Marco is Mexican but Diego is Spanish.
- Marco has always been a nice person, but Diego changed at the end of season 2.
- Marco has been absent for many episodes whilst Diego has been absent for none.