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
The template Far Cry: outposts, predators, and a tropical sandbox.

Execution · Practiced Mastery
A twin-stick shooter about aiming and matching weapons to scripted ghost waves.
Far Cry 3 leans Execution (Practiced Mastery); Ghostbusters: Sanctum of Slime leans Execution (Practiced Mastery).
Ghostbusters: Sanctum of Slime leans a little harder on execution, though the gap is small.
Far Cry 3
Shooting and stealth fundamentals matter.
Ghostbusters: Sanctum of Slime
Twin-stick aiming and dodging lead the combat
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Far Cry 3
Pirate AI uses fixed alert patterns.
Ghostbusters: Sanctum of Slime
Ghost enemies follow scripted patterns, not adapting
Ghostbusters: Sanctum of Slime leans a little harder on variance, though the gap is small.
Far Cry 3
Wildlife and outpost spawns randomized.
Ghostbusters: Sanctum of Slime
Enemy spawns and color-matching add some chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Far Cry 3
Skill trees and weapon mods quickly mastered.
Ghostbusters: Sanctum of Slime
Matching weapon colors to enemies rewards planning
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.