head to head
Warhammer 40,000: Kill Team asks more than Grand Theft Auto: San Andreas, and the gap is execution.

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

Execution · Practiced Mastery
A twin-stick action shooter testing aim and crowd control against scripted hordes.
Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery); Warhammer 40,000: Kill Team leans Execution (Practiced Mastery).
Warhammer 40,000: Kill Team leans clearly harder on execution.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Warhammer 40,000: Kill Team
Twin-stick aiming and dodging waves is the action core
Warhammer 40,000: Kill Team leans clearly harder on reads.
Grand Theft Auto: San Andreas
Gang AI is scripted, never adaptive
Warhammer 40,000: Kill Team
Enemy hordes are scripted, not adapting minds
Warhammer 40,000: Kill Team leans a little harder on variance, though the gap is small.
Grand Theft Auto: San Andreas
Territory wars and traffic add light randomness
Warhammer 40,000: Kill Team
Enemy spawns and drops add bounded randomness
Grand Theft Auto: San Andreas leans a little harder on optimization, though the gap is small.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
Warhammer 40,000: Kill Team
Class abilities and upgrade paths reward 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.