There are
Crippled Masters, The (1979) without Chinese Title and
Fighting Life (1981) with chinese credits both starring the same pair of
actors which are probably the real cripples (and Jack Conn still has no chinese names yet !!) which has the alternative Title Crippled Masters (without The) Could this really be two different films...?

Yes, that are two differnt movies. I have both of them on tape.

The "third" movie is Two Crippled Heroes also starring Frankie Shum and Jack Conn. But it´s not in the DB. It´s produced 1982 I think.

"Two Crippled Heroes": added movie, dir. and 4 actors.

I think it is very possible that Sam Chung-Chuen is identical with Frankie Shum and that Thomas Hong is Jack Conn.

About Frankie, I thought the same thing, but only 1 character is the same...