head to head
Grand Theft Auto IV asks more than Hong Kong 97, and the gap is optimization.

Execution · Practiced Mastery
A grittier crime story where weighty driving and gunplay carry the experience.

Execution · Twitch Chaos
A notoriously broken shooter testing nothing but tolerance and basic bullet dodging.
Grand Theft Auto IV leans Execution (Practiced Mastery); Hong Kong 97 leans Execution (Twitch Chaos).
Grand Theft Auto IV leans a little harder on execution, though the gap is small.
Grand Theft Auto IV
Heavier driving and cover shooting reward control.
Hong Kong 97
Dodging bullet spam with one-hit deaths is the only skill present
Grand Theft Auto IV leans a little harder on reads, though the gap is small.
Grand Theft Auto IV
Scripted AI, no adaptive opponent modeling.
Hong Kong 97
Enemies spawn in mindless waves
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto IV
Minor mission variance.
Hong Kong 97
Spawn patterns have slight randomness
Grand Theft Auto IV leans clearly harder on optimization.
Grand Theft Auto IV
Mission routing and weapon picks learnable.
Hong Kong 97
There is almost no system to optimise
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.