Well..from what I understood from the article on wikipedia "Da Dao Xing'' and "Xing Da Dao" are two diffrent books..altough they sound like the same one , but I don't know chinese so maybe I'm wrong.
Quote form wiki :
"The Chinese version of <Opening the Dragon Gate: The Making of a Modern Taoist〉is named <Da Dao Xing>..."
"By using contemporary languages, Master Wang teaches people parts of <Ling Bao Bi Fa> which is a book about Internal alchemy arts written by Zhongli Quan in Han Dynasty. The art of Master Wang's teaching were called "Internal alchemy of Ling Bao Intelligence Enlightenment". Another book named <Xing Da Dao> (means "Training for Universal Tao") was published in mainland China. In this book, the Master Wang's 20 years teaching philosophy and practices were recorded."
Anyway , I'm planning to buy now Kosta's book "Nei Kung", and maybe "Opening the Dragon Gate".
Thanks and good luck,