head to head
NBA 2K14 asks more than FIFA 99, and the gap is optimization.

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

Execution · Competitive PvP
Shot timing and play selection against opponents adjusting to your tendencies.
FIFA 99 leans Execution (Competitive PvP); NBA 2K14 leans Execution (Competitive PvP).
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
NBA 2K14
Shot release timing and dribble chains gate scoring
NBA 2K14 leans a little harder on reads, though the gap is small.
FIFA 99
Couch opponents can be conditioned and baited
NBA 2K14
Online opponents counter your favourite plays
FIFA 99 leans a little harder on variance, though the gap is small.
FIFA 99
Era physics produce regular fluke goals
NBA 2K14
Shot RNG sways close possessions
NBA 2K14 leans clearly harder on optimization.
FIFA 99
Simple formations and known exploit angles map fast
NBA 2K14
Playbook knowledge and roster management 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.