head to head
Project I.G.I.: I'm Going In 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
Planning and flawlessly executing long infiltration routes with no safety net.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Project I.G.I.: I'm Going In leans Execution (Practiced Mastery).
Project I.G.I.: I'm Going In leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Project I.G.I.: I'm Going In
No mid-mission saves makes every shot and sprint count
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
Project I.G.I.: I'm Going In
Guards follow alarm scripts, punishing but not adaptive
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
Project I.G.I.: I'm Going In
Patrols vary slightly, mostly memorisable layouts
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
Project I.G.I.: I'm Going In
Planning infiltration routes through bases is the core test
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.