head to head
Kingdom Hearts III asks more than Red Dead Redemption 2, and the gap is optimization.

Execution · Practiced Mastery
The saga's flashy conclusion sending Sora through Pixar and Disney worlds toward the Keyblade War.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
Kingdom Hearts III leans Execution (Practiced Mastery); Red Dead Redemption 2 leans Execution (Practiced Mastery).
Kingdom Hearts III leans a little harder on execution, though the gap is small.
Kingdom Hearts III
Limit Cut bosses require sharp reactions
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kingdom Hearts III
All opposition is scripted spectacle
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Red Dead Redemption 2 leans a little harder on variance, though the gap is small.
Kingdom Hearts III
Minimal hidden systems
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Kingdom Hearts III leans clearly harder on optimization.
Kingdom Hearts III
Attraction commands or boss study both solvable
Red Dead Redemption 2
Loadouts and routes solvable but loose.
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.