Saoirse Ronan and Kate Winslet each won acclaim as teenagers. Ronan was 13 when she earned an Oscar nom for “Atonement,” while Winslet was 17 when she burst onto the scene in Peter Jackson’s “Heavenly Creatures.” In their new films, both use accents that are not their own. Ronan headlines “Brooklyn,” playing an Irish girl who immigrates to New York in the 1950s. Winslet disappears behind a wig, glasses, and a Polish accent for “Steve Jobs” to portray Joanna Hoffman, a friend and adviser to the Apple founder.