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

Optimization · Practiced Mastery
A PSP prequel following three keyblade wielders with a deep command-melding build system.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
Kingdom Hearts Birth by Sleep leans Optimization (Practiced Mastery); Red Dead Redemption 2 leans Execution (Practiced Mastery).
Kingdom Hearts Birth by Sleep leans a little harder on execution, though the gap is small.
Kingdom Hearts Birth by Sleep
Dodge timing against brutal secret bosses
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 Birth by Sleep
Pattern-based bosses, no adaptation
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 Birth by Sleep
Command melding outcomes are documented
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Kingdom Hearts Birth by Sleep leans clearly harder on optimization.
Kingdom Hearts Birth by Sleep
Command deck melding largely solves the game
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.