head to head
8 Ball Pool asks more than Red Dead Redemption 2, and the gap is execution.

Execution · Practiced Mastery
Precise shot aiming plus planning the run-out several balls ahead.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
8 Ball Pool leans Execution (Practiced Mastery); Red Dead Redemption 2 leans Execution (Practiced Mastery).
8 Ball Pool leans clearly harder on execution.
8 Ball Pool
A perfect aim-line cheat wins nearly every rack outright
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
8 Ball Pool leans a little harder on reads, though the gap is small.
8 Ball Pool
Opponents alternate turns; little adaptive interaction to predict
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.
8 Ball Pool
Break spreads add some randomness to each rack
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
8 Ball Pool leans clearly harder on optimization.
8 Ball Pool
Position play and run-out planning separate good players
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.