head to head
Call of Duty asks more than Red Dead Redemption 2, and the gap is execution.

Execution · Practiced Mastery
The original 2003 WWII shooter built around cinematic squad set pieces.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
Call of Duty leans Execution (Practiced Mastery); Red Dead Redemption 2 leans Execution (Practiced Mastery).
Call of Duty leans clearly harder on execution.
Call of Duty
Aim and reaction carry the scripted firefights
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Call of Duty leans clearly harder on reads.
Call of Duty
Light multiplayer prediction; campaign AI is scripted
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty
Some spawn and hit unpredictability
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Call of Duty leans a little harder on optimization, though the gap is small.
Call of Duty
Memorising set pieces and weapon positions
Red Dead Redemption 2
Loadouts and routes solvable but loose.
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.