Only performers nominated for playing the same character in the same year, but in different films:
Judi Dench and Cate Blanchett both played England's Queen Elizabeth I in 1998, Dench in Shakespeare in Love (winning Best Supporting Actress) and Blanchett in Elizabeth (nominated for Best Actress). This first-time-ever coincidence was heightened by the appearance of Joseph Fiennes and Geoffrey Rush in both films.