Officials of the American and British actors' unions announced yesterday an agreement to share equally in the casting of the musical ''Carrie.''
The show, which is being produced by Friedrich Kurz and the Royal Shakespeare Company in association with Lawrence D. Cohen and Michael Gore, is to open in February at Stratford-Upon-Avon and at the Virginia Theater on Broadway in April.
The agreement - announced by the executive secretary of Actors' Equity Association, Alan Eisenberg, and Peter Plouviez, general secretary of British Actors' Equity Association - is the most recent in a series of exchanges negotiated by the two unions during the last five years. It calls for an equal number of British and American actors in the 30-member cast, exclusive of recognized stars (who are not included in the exchanges).
The agreement covers 10 weeks of rehearsal and performance in London and Stratford, followed by 18 weeks of rehearsal and performance in New York. After that, if the show is successful, the terms would be subject to renegotiation for both the continued Broadway run and a production in London's West End.
''Carrie,'' which is based on the Stephen King horror movie and has a book by Mr. Cohen, music by Mr. Gore and lyrics by Dean Pitchford, is being directed by the Royal Shakespeare's artistic director, Terry Hands.