head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Practiced Mastery
Arcade-style western shooter built around stage gunfights and showdown duels.

Execution · Pure Mechanics
A light-gun rail shooter testing target-snapping speed against memorised spawns.
Red Dead Revolver leans Execution (Practiced Mastery); Revolution X leans Execution (Pure Mechanics).
Revolution X leans a little harder on execution, though the gap is small.
Red Dead Revolver
Arcade gunplay and duel timing dominate
Revolution X
Light-gun target snapping is the entire demand
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Revolver
Enemies are scripted shooting-gallery foes
Revolution X
Enemies pop out on rigid arcade scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Red Dead Revolver
Minor spawn variation
Revolution X
Spawn points surprise only until memorised
Red Dead Revolver leans a little harder on optimization, though the gap is small.
Red Dead Revolver
Level layouts and duel rhythms are learnable
Revolution X
Memorising spawns and hostage spots boosts scores
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.