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
Precise jump execution across fixed levels with secrets to memorise.
Colin McRae Rally 2.0 leans Execution (Pure Mechanics); Super Mario World leans Execution (Pure Mechanics).
Colin McRae Rally 2.0 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
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
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
Super Mario World
Scripted Koopas adapt to nothing
Colin McRae Rally 2.0 leans a little harder on variance, though the gap is small.
Colin McRae Rally 2.0
Mid-stage surprises minimal once pace notes are internalised
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Colin McRae Rally 2.0 leans a little harder on optimization, though the gap is small.
Colin McRae Rally 2.0
Memorising stages and tuning setups converges times steadily
Super Mario World
Secret exits and route knowledge add a modest solvable layer
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.