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

Execution · Pure Mechanics
Routine shooter aim through scripted cartel firefights.

Execution · Pure Mechanics
Squad shooting against scripted hordes with light class-loadout decisions.
Call of Juarez: The Cartel leans Execution (Pure Mechanics); Resident Evil: Operation Raccoon City leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: The Cartel
Standard FPS gunfights run on aim alone
Resident Evil: Operation Raccoon City
Third-person aim against zombie and soldier swarms carries the game
Resident Evil: Operation Raccoon City leans a little harder on reads, though the gap is small.
Call of Juarez: The Cartel
Co-op secret objectives add mild teammate suspicion
Resident Evil: Operation Raccoon City
Versus modes add human prediction; campaign AI is scripted
Resident Evil: Operation Raccoon City leans a little harder on variance, though the gap is small.
Call of Juarez: The Cartel
Enemy waves spawn identically each run
Resident Evil: Operation Raccoon City
Infection mechanics and spawn chaos add mild unpredictability
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Juarez: The Cartel
Weapon levelling is a thin progression layer
Resident Evil: Operation Raccoon City
Class abilities and loadouts are a shallow solvable layer
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.