head to head
Mario Kart 8 Deluxe asks more than Killing Floor 2, and the gap is reads.

Execution · Practiced Mastery
Wave-based co-op horde shooter.

Execution · Twitch Chaos
A kart racer where item luck collides with optimized lines and builds.
Killing Floor 2 leans Execution (Practiced Mastery); Mario Kart 8 Deluxe leans Execution (Twitch Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Killing Floor 2
Headshot-focused aim and weapon-switching
Mario Kart 8 Deluxe
Drift boosts, snaking, and item timing demand precision.
Mario Kart 8 Deluxe leans clearly harder on reads.
Killing Floor 2
Scripted zeds, no adaptive opponent
Mario Kart 8 Deluxe
Human racers bait and block items but mostly reactive.
Mario Kart 8 Deluxe leans a little harder on variance, though the gap is small.
Killing Floor 2
Spawn waves and trader loot vary
Mario Kart 8 Deluxe
Item distribution heavily randomized by position.
Killing Floor 2 leans a little harder on optimization, though the gap is small.
Killing Floor 2
Perks, weapon synergies, money management
Mario Kart 8 Deluxe
Kart build, line, and shortcut knowledge define top times.
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.