head to head
Helldivers asks more than Red Dead Redemption 2, and the gap is variance.

Optimization · Practiced Mastery
Twin-stick co-op shooter precursor.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
Helldivers leans Optimization (Practiced Mastery); Red Dead Redemption 2 leans Execution (Practiced Mastery).
Helldivers leans a little harder on execution, though the gap is small.
Helldivers
Twin-stick aim and stratagem inputs
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Helldivers
Scripted enemies, no real reads
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Helldivers leans clearly harder on variance.
Helldivers
Random spawns and patrol pressure
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Helldivers leans clearly harder on optimization.
Helldivers
Loadout combos and stratagem chains
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.