Looks Familiar
At the beginning of Kickboxer 4 when Davids telling the story in a letter
to his wife,after it shows when Kurt beat Tong Po and Tong Po was
dishonored it shows a person spitting on Tong Po. When he was spit on it
looked like the old Tong Po from the Kickboxer 1. Perhaps that was cut
footage from part 1 or 2. Or maybe the original Tong Po filmed that one
scene or something and was replaced for the rest of the movie. This may be
an error by me but it looked like the old Tong Po in that scene.