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 · Competitive PvP
Timing on the ball and outguessing the opposing player's tactics.

Execution · Practiced Mastery
Tests arcade sports timing in a licensed fantasy sport with swingy Snitch catches.
FIFA Soccer 06 leans Execution (Competitive PvP); Harry Potter: Quidditch World Cup 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.
FIFA Soccer 06
First-touch control and shot timing decide chances
Harry Potter: Quidditch World Cup
Timing passes, tackles and Snitch chases needs moderate dexterity
FIFA Soccer 06 leans a little harder on reads, though the gap is small.
FIFA Soccer 06
Human opponents vary attack patterns and bait tackles
Harry Potter: Quidditch World Cup
Versus a friend, faking plays adds light prediction
Harry Potter: Quidditch World Cup leans a little harder on variance, though the gap is small.
FIFA Soccer 06
Bounces and keeper spills inject small randomness
Harry Potter: Quidditch World Cup
Snitch appearances and combo opportunities add swing
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 06
Squad selection and tactics reward preparation
Harry Potter: Quidditch World Cup
Special move charging and team choice reward system knowledge
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.