CREATE TABLE table_1901751_1 (original_australian_performer VARCHAR2, original_west_end_performer VARCHAR2)

How many original Australian performers are there when the Original West End Performer is Jordan Dunne?
SELECT COUNT(original_australian_performer) FROM table_1901751_1 WHERE original_west_end_performer = "Jordan Dunne"
SELECT COUNT("original_australian_performer") FROM "table_1901751_1" WHERE "Jordan Dunne" = "original_west_end_performer"