head to head
Star Control 3 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.

Optimization · Practiced Mastery
A space-strategy adventure mixing ship combat with empire resource management.
Red Dead Redemption 2 leans Execution (Practiced Mastery); Star Control 3 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.
Star Control 3
Ship melee combat needs decent aim and maneuvering
Star Control 3 leans clearly harder on reads.
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Star Control 3
AI captains use fixed tactics; some PvP melee allows prediction
Star Control 3 leans clearly harder on variance.
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Star Control 3
Exploration and resource discovery are scripted-but-unknown
Star Control 3 leans clearly harder on optimization.
Red Dead Redemption 2
Loadouts and routes solvable but loose.
Star Control 3
Fleet building, colonization and resource management drive progress
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.