head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Pure Mechanics
Committed rally driving where memorised stages meet precise throttle-and-slide control.

Execution · Practiced Mastery
An isometric combat racer set to metal covers, mixing vehicle upgrades with weaponized laps.
Colin McRae Rally 04 leans Execution (Pure Mechanics); Rock n' Roll Racing leans Execution (Practiced Mastery).
Colin McRae Rally 04 leans a little harder on execution, though the gap is small.
Colin McRae Rally 04
Millisecond car control on loose surfaces is the whole test
Rock n' Roll Racing
Isometric cornering and weapon timing carry races.
Rock n' Roll Racing leans a little harder on reads, though the gap is small.
Colin McRae Rally 04
Solo against the stage clock
Rock n' Roll Racing
Two-player duels add slight prediction; AI is scripted.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Colin McRae Rally 04
Damage and surface conditions add minor unknowns
Rock n' Roll Racing
Weapon exchanges and pickups create chaos.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Colin McRae Rally 04
Setup tuning and stage memorisation compound lap time
Rock n' Roll Racing
Upgrade purchases and planet-by-planet earnings are plannable.
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.