head to head
Mario Kart 8 asks more than South Park Rally, and the gap is variance.

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

Execution · Twitch Chaos
Sloppy kart handling where random items swing races more than driving skill.
Mario Kart 8 leans Execution (Twitch Chaos); South Park Rally leans Execution (Twitch Chaos).
Mario Kart 8 leans a little harder on execution, though the gap is small.
Mario Kart 8
precise drifting and item timing matter
South Park Rally
Loose kart handling still rewards clean driving
South Park Rally leans a little harder on reads, though the gap is small.
Mario Kart 8
minimal, mostly reacting not predicting
South Park Rally
Human racers in versus add slight prediction
Mario Kart 8 leans clearly harder on variance.
Mario Kart 8
item boxes are heavily randomized
South Park Rally
Random weapon pickups swing race outcomes
Mario Kart 8 leans a little harder on optimization, though the gap is small.
Mario Kart 8
track lines and item strategy solvable
South Park Rally
Track shortcuts and item timing are learnable
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.