head to head
Sniper Elite III asks more than Red Dead Redemption 2, and the gap is optimization.

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

Execution · Practiced Mastery
Plannable stealth routing punctuated by precise ballistic marksmanship.
Red Dead Redemption 2 leans Execution (Practiced Mastery); Sniper Elite III leans Execution (Practiced Mastery).
Sniper Elite III leans a little harder on execution, though the gap is small.
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Sniper Elite III
Ballistic long shots demand steady, compensated aim
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.
Sniper Elite III
Enemy AI follows mappable alert and search routines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Sniper Elite III
Patrol details and wind vary slightly per attempt
Sniper Elite III leans clearly harder on optimization.
Red Dead Redemption 2
Loadouts and routes solvable but loose.
Sniper Elite III
Open maps reward planned routes, sound masking and relocation
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.