head to head
Call of Duty 3 asks more than Baseball, and the gap is execution.
Execution · Competitive PvP
A primitive timing-and-guessing duel over pitches and swings.

Execution · Pure Mechanics
WWII gunfight execution with light multiplayer prediction.
Baseball leans Execution (Competitive PvP); Call of Duty 3 leans Execution (Pure Mechanics).
Call of Duty 3 leans clearly harder on execution.
Baseball
Swing timing and pitch placement need modest precision
Call of Duty 3
Aimbot trivialises both campaign and multiplayer gunfights
Baseball leans a little harder on reads, though the gap is small.
Baseball
Versus a human, pitch-guessing is a genuine prediction duel
Call of Duty 3
Multiplayer adds modest human positional prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Baseball
Fielder AI quirks add some outcome noise
Call of Duty 3
Scripted setpieces and spawn flow add minor unknowns
Call of Duty 3 leans a little harder on optimization, though the gap is small.
Baseball
Few systems beyond basic pitch selection exist
Call of Duty 3
Map knowledge and weapon choice reward light 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.