head to head
Mario Kart 8 asks more than Zueirama, and the gap is execution.

Execution · Twitch Chaos
A kart racer where controlled chaos from random items tempers otherwise precise driving skill.

Variance · Twitch Chaos
A chaotic Brazilian comedy-themed arcade game.
Mario Kart 8 leans Execution (Twitch Chaos); Zueirama leans Variance (Twitch Chaos).
Mario Kart 8 leans clearly harder on execution.
Mario Kart 8
precise drifting and item timing matter
Zueirama
simple arcade-style reflex inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart 8
minimal, mostly reacting not predicting
Zueirama
no adaptive opponent modeling player
Mario Kart 8 leans clearly harder on variance.
Mario Kart 8
item boxes are heavily randomized
Zueirama
chaotic random comedic events
Mario Kart 8 leans clearly harder on optimization.
Mario Kart 8
track lines and item strategy solvable
Zueirama
minimal solvable systems present
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.