head to head
NHL 2K6 asks more than Grand Theft Auto V, and the gap is reads.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Execution · Practiced Mastery
Stick execution and opponent prediction over a franchise-management layer.
Grand Theft Auto V leans Execution (Practiced Mastery); NHL 2K6 leans Execution (Practiced Mastery).
NHL 2K6 leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
NHL 2K6
Shot timing, dekes and poke checks decide possessions
NHL 2K6 leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
NHL 2K6
Human opponents disguise plays and bait pulls online
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Some mission and lobby randomness.
NHL 2K6
Rebounds and deflections add per-game noise
NHL 2K6 leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
NHL 2K6
Line management and franchise decisions reward planning
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.