head to head
Ratchet & Clank: Full Frontal Assault asks more than Grand Theft Auto: San Andreas, and the gap is reads.

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

Execution · Practiced Mastery
Shooter-platforming crossed with base defense, testing weapon execution and turret planning.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Ratchet & Clank: Full Frontal Assault leans Execution (Practiced Mastery).
Ratchet & Clank: Full Frontal Assault leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Ratchet & Clank: Full Frontal Assault
Weapon juggling and movement carry the defense waves
Ratchet & Clank: Full Frontal Assault leans clearly harder on reads.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Ratchet & Clank: Full Frontal Assault
Competitive raids against humans reward predicting attack lanes
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Ratchet & Clank: Full Frontal Assault
Wave compositions are mostly known after few runs
Grand Theft Auto: San Andreas leans a little harder on optimization, though the gap is small.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Ratchet & Clank: Full Frontal Assault
Turret placement and node economy are plannable systems
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.