Casablanca (Morocco); Casa Branca (Brazil)
Refers to the city in Morocco or the municipality in Brazil. Context usually makes the intended location clear.
Casablanca is the largest city in Morocco.
Casa Branca in Brazil is in the state of São Paulo.
Casablanca (1942 film)
Refers specifically to the classic 1942 film starring Humphrey Bogart and Ingrid Bergman.
The film "Casablanca" was released in 1942.