head to head
Into the Dead 2 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
An endless-runner shooter testing steering and aim against zombie crowds.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Into the Dead 2 leans Execution (Practiced Mastery).
Into the Dead 2 leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Into the Dead 2
Steering and aiming while auto-running drives survival
Into the Dead 2 leans a little harder on reads, though the gap is small.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Into the Dead 2
Zombies shamble on scripts, no prediction
Into the Dead 2 leans clearly harder on variance.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Into the Dead 2
Spawn placement and pickup drops vary each run
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
Into the Dead 2
Weapon loadout and upgrade choices reward planning
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.