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 · Competitive PvP
Stick execution and outguessing a human defender, with tactics underneath.

Execution · Pure Mechanics
Famously unforgiving ball control tested against human prediction in fast matches.
FIFA Soccer 08 leans Execution (Competitive PvP); Kick Off 2 leans Execution (Pure Mechanics).
Kick Off 2 leans a little harder on execution, though the gap is small.
FIFA Soccer 08
Dribbling, timing tackles and finishing reward stick skill
Kick Off 2
The ball never sticks - constant trapping demands famously precise control
FIFA Soccer 08 leans a little harder on reads, though the gap is small.
FIFA Soccer 08
Versus humans, baiting defenders and disguising attacks is core
Kick Off 2
Human matches reward predicting passes and tackle timing
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 08
Ball physics adds bounce noise to single matches
Kick Off 2
Pitch types and deflections add mild chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA Soccer 08
Formations and squad selection matter but stay shallow
Kick Off 2
Set plays and formation knowledge sit underneath
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.