According to HKFA, they are the same person as both movies are credited to (???) .

Yau Gong-Gin / (???) http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng


Yau-Daai On-Ping / (????) http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng

Yau Daai On Ping alias is Yau Kong Kin.

Can anyone confirm and update?

If nobody stops me in 15 days I will merge them.

merged

Yau Gong-Gin
???
Filmography (1974)
Director
Valley of the Double Dragon (1974)

and

Yau-Daai On-Ping ?
????
Aliases: Yau-Tai On-Ping, Qiu-Dai An-Ping, Chui-Dai An-Ping, Daai On-Ping, Yau Gong-Kin, Chiu Kang-Chien, Yau Kong-Kin, Chiu Kang-Chian, ???? (2), ????, ???, ???
Born: 1940

Filmography (1968-2006)

Story
Sketch (1983)
Dream Lovers (1986)
Director
The Drinking Knight (1970)
Tong Chee Yi Li Nan (1985)
Little Woman (1993)
Actor
An Amorous Woman of Tang Dynasty (1984)
Tong Chee Yi Li Nan (1985)
Planning
The Banquet (2006)
Costume Designer
Tong Chee Yi Li Nan (1985)
Writer
The Bells of Death (1968)
Dead End (1969)
The Singing Thief (1969)
Twin Blades of Doom (1969)
The Singing Killer (1970)
The Duel (1971)
The Long Chase (1971)
The Yellow Killer (1972)
Intimate Confessions of a Chinese Courtesan (1972)
Finger of Doom (1972)
Payment in Blood (1973)
The Bastard (1973)
The Kiss of Death (1973)
Devil and Angel (1973)
The Rendezvous of Warriors (1973)
Thou Shall Not Kill ... But Once (1975)
Kissed by the Wolves (1975)
Night of the Devil's Bride (1975)
The Secret of the Shaolin Poles (1977)
Soul of the Sword (1978)
Big Land, Flying Eagles (1978)
Mei Fan Ma Ma (1980)
Postman Strikes Back (1982)
Nomad (1982)
Boat People (1982)
Coolie Killer (1982)
An Amorous Woman of Tang Dynasty (1984)
Tong Chee Yi Li Nan (1985)
Women (1985)
Love Unto Waste (1986)
Dream Lovers (1986)
Rouge (1988)
Profiles of Pleasure (1988)
Hearts No Flowers (1989)
I Am Sorry (1989)
Full Moon in New York (1990)
Centre Stage (1992)
Little Woman (1993)
The Banquet (2006)