In "My Darling Slave" (1974) there are both listed, but HKFA and the poster credits only show ?? and no ??.
And in "Old Master Q" they are again listed together (HKFA too) could be an editing credits error, but after watching both sides
Ban Ban (1) ?? http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng and
Ban Ban (2) ?? http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng
I am convinced that could be the same person after all..or not?

According to Baike

Banban (??), formerly known as Li Xiaowen (???), was born in Hong Kong, China, a female artist in Hong Kong, China.
Bianban (??) (called Binbin ?? at the time) once formed The Bumble Bees with his sister Sensen / Sam Sam (??) and 4 male musicians. In 1973, Ban Ban joined the wireless "Happy Tonight" and formed the Sen Ban Ban Chorus with Sen Sen, mainly with other singers...

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

Merged

??(1)
Ban Ban (1) ?

Filmography (1967-1978)

Actor (8 films)
Tragedy in a Fishing Village (1967)
We All Enjoy Ourselves Tonight (1968) ... [Cameo]
Mother Wants Me to Get Married (1969) ... [Cameo]
I Will Remember You Always (1970) ... Tina Mak
My Darling Slave (1974)
Moon and Stars (1975)
Old Master Q (1975)
Con Artists (1978)


and

??
Ban Ban (2) ?

Filmography (1974-1975)

Actor (3 films)
My Darling Slave (1974)
Gossip Street (1974) ... Ban Ban
Old Master Q (1975)