head to head
Grand Theft Auto V asks more than Zombie Shooter 2, and the gap is reads.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Execution · Practiced Mastery
A top-down shooter about mowing through zombie hordes with upgradable weapons.
Grand Theft Auto V leans Execution (Practiced Mastery); Zombie Shooter 2 leans Execution (Practiced Mastery).
Zombie Shooter 2 leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Zombie Shooter 2
twin-stick aim against zombie hordes
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Zombie Shooter 2
scripted zombie waves, no adaptation
Zombie Shooter 2 leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Zombie Shooter 2
loot drops and spawn randomness
Zombie Shooter 2 leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Zombie Shooter 2
weapon upgrade and build optimization
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.