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
Pure car control over loose surfaces, sharpened by memorising every stage.

Execution · Pure Mechanics
Punishing rally car control at the limit, supported by setup and stage knowledge.
Colin McRae Rally 2.0 leans Execution (Pure Mechanics); Dirt Rally leans Execution (Pure Mechanics).
Dirt Rally leans a little harder on execution, though the gap is small.
Colin McRae Rally 2.0
Surface-specific car control at speed decides every stage
Dirt Rally
Unforgiving car control on loose surfaces is the entire test
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Colin McRae Rally 2.0
Time-trial format - no adaptive opponent on the stage
Dirt Rally
Solo time trials against the clock, no adaptive rival
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Colin McRae Rally 2.0
Mid-stage surprises minimal once pace notes are internalised
Dirt Rally
Weather and surface degradation vary between stages
Dirt Rally leans a little harder on optimization, though the gap is small.
Colin McRae Rally 2.0
Memorising stages and tuning setups converges times steadily
Dirt Rally
Pacenote interpretation, setup tuning and stage memorisation
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.