After watching Last Train Out of Kaohsiung (1963) I am convinced that this is the same person (since there was only one fatty guy in it)
Second reason is that Li Kuan-Chang's Filmography contains already 5 films with role name Brother Wang (Wang Ge)
http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng
http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng

Ears are the same!... but I do not believe this man is only 15 years old: http://hkmdb.com/db/movies/image_detail ... ay_set=eng

Maybe I am wrong with that after watching another movie