head to head
Mario Kart 8 asks more than Alto's Adventure, and the gap is optimization.

Execution · Twitch Chaos
A serene endless snowboarder about chaining backflips down procedurally generated slopes.

Execution · Twitch Chaos
A kart racer where controlled chaos from random items tempers otherwise precise driving skill.
Alto's Adventure leans Execution (Twitch Chaos); Mario Kart 8 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.
Alto's Adventure
One-touch trick timing and landings
Mario Kart 8
precise drifting and item timing matter
Mario Kart 8 leans a little harder on reads, though the gap is small.
Alto's Adventure
No opponents
Mario Kart 8
minimal, mostly reacting not predicting
Mario Kart 8 leans clearly harder on variance.
Alto's Adventure
Procedural terrain keeps runs unpredictable
Mario Kart 8
item boxes are heavily randomized
Mario Kart 8 leans clearly harder on optimization.
Alto's Adventure
Goal checklist and combo logic shallow
Mario Kart 8
track lines and item strategy solvable
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.