head to head
FIFA 99 asks more than Need for Speed: World, and the gap is reads.

Execution · Competitive PvP
Late-90s arcade football execution with couch-versus prediction and bouncy luck.

Execution · Practiced Mastery
MMO street racing testing driving lines plus grindable car-build advantage.
FIFA 99 leans Execution (Competitive PvP); Need for Speed: World 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 99
Quick passing and shot timing in arcade-leaning football
Need for Speed: World
Racing lines, drift control and pursuit evasion reward clean hands
FIFA 99 leans clearly harder on reads.
FIFA 99
Couch opponents can be conditioned and baited
Need for Speed: World
Human rivals in lobbies add slight positional prediction
FIFA 99 leans a little harder on variance, though the gap is small.
FIFA 99
Era physics produce regular fluke goals
Need for Speed: World
Pursuit spawns and lobby skill add mild noise
Need for Speed: World leans a little harder on optimization, though the gap is small.
FIFA 99
Simple formations and known exploit angles map fast
Need for Speed: World
Car builds, powerups and route knowledge compound advantage
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.