head to head
S.T.A.L.K.E.R.: Call of Pripyat asks more than Red Dead Redemption 2, and the gap is variance.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.

Optimization · Practiced Mastery
The most polished S.T.A.L.K.E.R., a freeform survival shooter around Pripyat.
Red Dead Redemption 2 leans Execution (Practiced Mastery); S.T.A.L.K.E.R.: Call of Pripyat leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
S.T.A.L.K.E.R.: Call of Pripyat
Deliberate gunplay against mutants and stalkers
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
S.T.A.L.K.E.R.: Call of Pripyat
A-Life simulation doesn't counter-adapt to you
S.T.A.L.K.E.R.: Call of Pripyat leans clearly harder on variance.
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
S.T.A.L.K.E.R.: Call of Pripyat
Emissions, artifact spawns, and mutant encounters are random
S.T.A.L.K.E.R.: Call of Pripyat leans clearly harder on optimization.
Red Dead Redemption 2
Loadouts and routes solvable but loose.
S.T.A.L.K.E.R.: Call of Pripyat
Detector use, upgrades, and quest routing converge
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.