head to head
Grand Theft Auto V asks more than Super Mario Land 2: 6 Golden Coins, and the gap is reads.

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

Execution · Practiced Mastery
An open-structured Game Boy Mario where six zones guard coins that unlock Wario's castle.
Grand Theft Auto V leans Execution (Practiced Mastery); Super Mario Land 2: 6 Golden Coins leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Super Mario Land 2: 6 Golden Coins
Forgiving jumps but bosses still test timing
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Super Mario Land 2: 6 Golden Coins
No adaptive opposition anywhere
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Super Mario Land 2: 6 Golden Coins
Secret exits hidden until discovered
Super Mario Land 2: 6 Golden Coins leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Super Mario Land 2: 6 Golden Coins
Nonlinear zone order and secret levels 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.