head to head
Left 4 Dead asks more than Apsulov: End of Gods, and the gap is execution.

Variance · Twitch Chaos
Scripted horror evasion whose tension dissolves once threats are mapped.

Execution · Twitch Chaos
Co-op zombie shooter whose AI Director reshuffles every run to keep teams honest.
Apsulov: End of Gods leans Variance (Twitch Chaos); Left 4 Dead leans Execution (Twitch Chaos).
Left 4 Dead leans clearly harder on execution.
Apsulov: End of Gods
Stealth evasion and sprints need only light reflexes
Left 4 Dead
Headshots, melee shoves, and special-infected reaction time
Left 4 Dead leans clearly harder on reads.
Apsulov: End of Gods
Monsters patrol on scripts, not minds
Left 4 Dead
Versus mode adds human ambush mindgames
Left 4 Dead leans a little harder on variance, though the gap is small.
Apsulov: End of Gods
First-run dread comes from unknown scripted threats
Left 4 Dead
AI Director randomizes hordes, items, and specials
Left 4 Dead leans clearly harder on optimization.
Apsulov: End of Gods
Routes and codes are learnable, then trivial
Left 4 Dead
Team spacing, route choice, and resource discipline
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.