There's also the gap in between the films: this other Cheng's only acting credit being in 1966, it's a bit of a gap that leads me to think it's not the same person. Speaking of which I think there might be a third Cheng Ri-qing as the only other credit is as a singer in 1996, a huge 30 year gap, so someone with better knowledge than me about Taiwan might want to look into splitting those credits into 2 separate people.
So I created a new page, Cheng Ri-Qing (2), but as you all know, the Chinese spelling of names can change from film to film, so if someone thinks this might be someone already on the HKMDB, please let me know.
Also could someone please add the Chinese name for Korean Motion Picture Promotion (H.K.) Ltd. it's shown in the photo below, it'd just take a lot longer for me to try and find all the correct characters than someone more familiar with Chinese.

Cheers