Instant Kung Fu Man (1977) on Netflix

Plot summary

At the Shaolin Monastery, Hsia Hu goes through a graduation while his required training is still unfinished. In his first encounters with people beyond the monastery walls, he realizes that they are taking him for his twin brother, Hsiao Fu, a criminal and an expert in kung fu, and that they greet him with both respect and fear. The twins are opposites: Hsia Hu is a disciple of Shaolin, Hsiao Fu a bandit, and the two trade places, so their pursuers each follow the wrong brother. Hsia Hu lets the strangers keep their mistake and turns the mistaken identity to his own ends.