Question: Were Sidney Morgan and Berthold Viertel of the same nationality?

Context paragraphs:
Nora (1923 film): Nora is a 1923 German silent drama film directed by Berthold Viertel and starring Olga Tschechowa, Carl Ebert and Fritz Kortner.  It is an adaptation of the 1879 play "A Doll's House" by Henrik Ibsen.  It premiered in Berlin on 2 February 1923.  The film's art direction was by Walter Reimann.

Little Friend (film): Little Friend is a 1934 British drama film directed by Berthold Viertel and starring Matheson Lang, Nova Pilbeam and Lydia Sherwood.  The film was based on a novel by Ernst Lothar and adapted for the screen by Margaret Kennedy and Christopher Isherwood.

Salka and Berthold Viertel House: The Salka and Berthold Viertel House at 165 North Mabery Road in Santa Monica, California, was the home of the Austrian screenwriter Salka Viertel and her husband Bertold from 1933 to 1944.

A Window in Piccadilly: A Window in Piccadilly is a 1928 British silent romance film directed by Sidney Morgan and starring Joan Morgan, John F. Hamilton and James Carew.  It was made at Twickenham Studios as an independent production by Sidney Morgan.

The Wiser Sex: The Wiser Sex is a 1932 American Pre-Code crime drama film made by Paramount Pictures, directed by Berthold Viertel and Victor Viertel, and starring Claudette Colbert, Melvyn Douglas, Lilyan Tashman, William "Stage" Boyd and Ross Alexander.

The Magnificent Lie: The Magnificent Lie is a 1931 American drama film directed by Berthold Viertel and written by Vincent Lawrence, Leonard Merrick and Samson Raphaelson.  The film stars Ruth Chatterton, Ralph Bellamy, Stuart Erwin, Françoise Rosay, Sam Hardy, Charles Boyer and Tyler Brooke.  The film was released on July 25, 1931, by Paramount Pictures.

Sidney Morgan: Sidney Morgan (2 August 1874 – 11 June 1946) was an English film director, screenwriter, producer and actor.  He directed 45 films between 1914 and 1937.  As an actor, he appeared in the Alfred Hitchcock film "Juno and the Paycock".

The Man from Yesterday: The Man from Yesterday is a 1932 American pre-Code romantic war drama film made by Paramount Pictures, directed by Berthold Viertel, and written by Oliver H. P. Garrett, based on a story by Neil Blackwell and Rowland G. Edwards.

Berthold Viertel: Berthold Viertel (28 June 1885 - 24 September 1953) was an Austrian screenwriter and film director notable for his work in Germany, Britain and the United States.

Rhodes of Africa: Rhodes of Africa is a 1936 British biographical film charting the life of Cecil Rhodes.  It was directed by Berthold Viertel and starred Walter Huston, Oskar Homolka, Basil Sydney and Bernard Lee.

Supporting paragraphs: Sidney Morgan Berthold Viertel
Answer: no