I think they are two different actors.
Lo Hoi-Pang is a famous supporting actor in HK who debuted in the 70s.
http://simonyam.com/hkmw/Actors/LoHoiPang/
Leo Lo is a "young" new star, debuted in the 2000s.
As well as "Killer 2" (2003) he worked on "Memento" and "Salon Beauty" (both from 2002), which never have been attributed to Lo Hoi-Pang in english sites...
Anyone hold other clues?
