head to head
Kingdom Hearts II asks more than Grand Theft Auto V, and the gap is execution.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Execution · Practiced Mastery
The series' action peak, with flashy drive forms and superbosses that built a lasting challenge-run community.
Grand Theft Auto V leans Execution (Practiced Mastery); Kingdom Hearts II leans Execution (Practiced Mastery).
Kingdom Hearts II leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Kingdom Hearts II
Revenge values and Data fights demand precise play
Grand Theft Auto V leans a little harder on reads, though the gap is small.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Kingdom Hearts II
Even superbosses run scripted, mappable patterns
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Kingdom Hearts II
Fully visible action systems
Kingdom Hearts II leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Kingdom Hearts II
Forms, abilities, and boss study reward labbing
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.