head to head
Grand Theft Auto: San Andreas asks more than Army of Two: The Devil's Cartel, and the gap is optimization.

Execution · Practiced Mastery
Straightforward cover-shooting aim against fully scripted enemy waves.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
Army of Two: The Devil's Cartel leans Execution (Practiced Mastery); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
Army of Two: The Devil's Cartel leans a little harder on execution, though the gap is small.
Army of Two: The Devil's Cartel
Cover shooting rewards decent aim, nothing more
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Army of Two: The Devil's Cartel
Cartel enemies follow scripted cover AI
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Grand Theft Auto: San Andreas leans a little harder on variance, though the gap is small.
Army of Two: The Devil's Cartel
Encounters replay identically
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Grand Theft Auto: San Andreas leans clearly harder on optimization.
Army of Two: The Devil's Cartel
Weapon customization adds light loadout math
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
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.