For works released in the same year and language, and in different countries, but with different titles, use the title found on the work as the title proper.  Record other titles in a note.  See 7B4

If the cataloging agency holds both works, choose the title of the work as released in the country of the cataloging agency as the title proper.  The other title should be used as a variant title.  If the works are not in the language of the cataloging agency, choose one title as the title proper and use the other as a variant title.

See also:

1B.  Title proper

1.  Title and Statement of Responsibility Area