I find it strange that they both have the same year of birth and date of death:

https://hkmdb.com/db/people/view.mhtml? ... ay_set=eng

and

https://hkmdb.com/db/people/view.mhtml? ... ay_set=eng

Coincidence or mistake?

I found sources that the dates for Hon Kwok-Choi are correct.

Good find. Very interesting. After looking into this I have my doubts that Addy Sung (宋金來) is even dead. He left acting/directing and returned to being a performer in Cantonese opera. His real name is 宋錦成. As such, I am going to remove his dates of birth and death until I can find some more information on him in HK newspaper archives.