OK, I put the caps here, so we can see them together:
These are NOT Sammo:
This IS Sammo:
The guy up there is
at least 40 years old. Sammo at the time of this film was 19, and it shows...
This is Hapkido 1972. Little Sammo has round, very round face here, and that elder guy has oval face. Looks like he could be Sammo's dad.
Also, Sammo's scar on his lips can be shown clearly and that man has none.
I'd bet my life on it that only the last 2 pics are Sammo here.
Only this and death is sure in this life, believe me!