head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto: San Andreas demands more optimization; NecroVisioN: Lost Company demands more execution.

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.

Execution · Practiced Mastery
Run-and-gun reflexes against scripted zombie and demon waves in WWI trenches.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); NecroVisioN: Lost Company leans Execution (Practiced Mastery).
NecroVisioN: Lost Company leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
NecroVisioN: Lost Company
Twitch shooting and melee-combo timing carry the campaign
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
NecroVisioN: Lost Company
Zombie and demon waves are scripted, never adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
NecroVisioN: Lost Company
Enemy placements are fixed once a level is known
Grand Theft Auto: San Andreas leans clearly harder on optimization.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
NecroVisioN: Lost Company
Weapon choice and secret-hunting reward modest 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.