head to head
Card Shark asks more than Grand Theft Auto V, and the gap is execution.

Execution · Practiced Mastery
A dexterity-focused card-cheating game where executing sleight-of-hand maneuvers under time pressure is the primary test.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Card Shark leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Card Shark leans clearly harder on execution.
Card Shark
Cheating gestures require precise timing and sleight-of-hand inputs
Grand Theft Auto V
Driving and shooting demand decent inputs.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Card Shark
NPC marks follow scripted reactions; not truly adaptive
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Card Shark leans a little harder on variance, though the gap is small.
Card Shark
Card distribution contains some hidden info but is secondary
Grand Theft Auto V
Some mission and lobby randomness.
Card Shark leans a little harder on optimization, though the gap is small.
Card Shark
Learning optimal cheat sequences and tells is a solvable puzzle
Grand Theft Auto V
Heists, money loops, builds learnable.
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.