head to head
Left 4 Dead asks more than Kirby's Dream Buffet, and the gap is execution.

Execution · Twitch Chaos
A party racing game about rolling Kirby to collect the most strawberries.

Execution · Twitch Chaos
Co-op zombie shooter whose AI Director reshuffles every run to keep teams honest.
Kirby's Dream Buffet leans Execution (Twitch Chaos); Left 4 Dead leans Execution (Twitch Chaos).
Left 4 Dead leans clearly harder on execution.
Kirby's Dream Buffet
Rolling and dodging on courses needs decent control
Left 4 Dead
Headshots, melee shoves, and special-infected reaction time
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Dream Buffet
Human racers add light prediction but items dominate
Left 4 Dead
Versus mode adds human ambush mindgames
Left 4 Dead leans a little harder on variance, though the gap is small.
Kirby's Dream Buffet
Item pickups and course chaos swing outcomes
Left 4 Dead
AI Director randomizes hordes, items, and specials
Left 4 Dead leans clearly harder on optimization.
Kirby's Dream Buffet
Knowing shortcuts and ability use helps modestly
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.