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

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

Execution · Practiced Mastery
Aggressive circuit racing testing car control over memorisable tracks and braking points.
Need for Speed: Hot Pursuit 2 leans Execution (Practiced Mastery); Race Driver: Grid leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Need for Speed: Hot Pursuit 2
High-speed cornering and traffic dodging are the whole test
Race Driver: Grid
Aggressive wheel-to-wheel car control is the core demand
Race Driver: Grid 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
Race Driver: Grid
Online racing adds light opponent positioning awareness
Need for Speed: Hot Pursuit 2 leans a little harder on variance, though the gap is small.
Need for Speed: Hot Pursuit 2
Cop spawns and traffic add mild run-to-run noise
Race Driver: Grid
Damage outcomes add slight unpredictability to contact
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
Race Driver: Grid
Braking points, lines and flashback management are learnable
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.