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
Throttle and counter-steer precision on loose surfaces against the clock.

Execution · Practiced Mastery
An isometric combat racer set to metal covers, mixing vehicle upgrades with weaponized laps.
Colin McRae: Dirt leans Execution (Pure Mechanics); Rock n' Roll Racing leans Execution (Practiced Mastery).
Colin McRae: Dirt leans a little harder on execution, though the gap is small.
Colin McRae: Dirt
Car control on loose surfaces is the entire test
Rock n' Roll Racing
Isometric cornering and weapon timing carry races.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Colin McRae: Dirt
Racing the clock or AI lines, nothing adapts
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: Dirt
Surface grip and damage add mild run noise
Rock n' Roll Racing
Weapon exchanges and pickups create chaos.
Rock n' Roll Racing leans a little harder on optimization, though the gap is small.
Colin McRae: Dirt
Setup tuning and corner-line knowledge underpin pace
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.