head to head
Ratchet & Clank: Into the Nexus asks more than Grand Theft Auto: San Andreas, and the gap is execution.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.

Execution · Practiced Mastery
A third-person action platformer where you blast scripted alien hordes while leveling an arsenal of gadgets.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Ratchet & Clank: Into the Nexus leans Execution (Practiced Mastery).
Ratchet & Clank: Into the Nexus leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Ratchet & Clank: Into the Nexus
Aiming, strafing, and platforming under fire carry combat
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Ratchet & Clank: Into the Nexus
Scripted enemy waves; no adaptive opponent
Grand Theft Auto: San Andreas leans a little harder on variance, though the gap is small.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Ratchet & Clank: Into the Nexus
Fixed level layouts, minimal hidden information
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Ratchet & Clank: Into the Nexus
Weapon upgrade paths, bolt economy, gold bolt routing
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.