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 · Practiced Mastery
Arcade car control at speed over memorised tracks with scripted police pressure.

Execution · Pure Mechanics
A rally sim testing relentless car control plus stage memorisation and setup.
Need for Speed: Hot Pursuit 2 leans Execution (Practiced Mastery); WRC 10 leans Execution (Pure Mechanics).
WRC 10 leans a little harder on execution, though the gap is small.
Need for Speed: Hot Pursuit 2
High-speed cornering and traffic dodging are the whole test
WRC 10
Rally car control on loose surfaces is relentless precision
Need for Speed: Hot Pursuit 2 leans a little harder on reads, though the gap is small.
Need for Speed: Hot Pursuit 2
AI racers and cops follow rubber-band scripts
WRC 10
Racing the clock, not a mind
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Need for Speed: Hot Pursuit 2
Cop spawns and traffic add mild run-to-run noise
WRC 10
Weather and surface conditions add modest unpredictability
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Need for Speed: Hot Pursuit 2
Track knowledge and racing lines are learnable and fixed
WRC 10
Setup tuning and memorising stage notes reward study
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.