head to head
Hand Simulator: Survival asks more than Warhammer 40,000: Space Marine 2, and the gap is variance.

Execution · Pure Mechanics
A survival game whose difficulty comes from awkward physics-based hand control.

Execution · Practiced Mastery
Co-op-focused action sequel hurling Titus against Tyranid swarms with parry-heavy melee combat.
Hand Simulator: Survival leans Execution (Pure Mechanics); Warhammer 40,000: Space Marine 2 leans Execution (Practiced Mastery).
Hand Simulator: Survival leans a little harder on execution, though the gap is small.
Hand Simulator: Survival
Clumsy fine motor control of hands is the whole joke
Warhammer 40,000: Space Marine 2
Parry, dodge and gun-strike timing against swarms
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Hand Simulator: Survival
Other players exist but combat is chaotic, not modeling
Warhammer 40,000: Space Marine 2
PvP Eternal War adds some human prediction
Hand Simulator: Survival leans clearly harder on variance.
Hand Simulator: Survival
Physics chaos and spawns create unpredictable situations
Warhammer 40,000: Space Marine 2
Tyranid swarm spawns vary run to run
Warhammer 40,000: Space Marine 2 leans a little harder on optimization, though the gap is small.
Hand Simulator: Survival
Crafting and survival systems reward some planning
Warhammer 40,000: Space Marine 2
Class builds and perk loadouts 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.