head to head
Mario Kart 64 asks more than Alto's Adventure, and the gap is reads.

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

Execution · Twitch Chaos
N64 couch classic where blue shells and shortcuts decide friendships.
Alto's Adventure leans Execution (Twitch Chaos); Mario Kart 64 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 64
Mini-turbo snaking and shortcut execution
Mario Kart 64 leans clearly harder on reads.
Alto's Adventure
No opponents
Mario Kart 64
Couch rivals bait shells and fakes
Mario Kart 64 leans a little harder on variance, though the gap is small.
Alto's Adventure
Procedural terrain keeps runs unpredictable
Mario Kart 64
Item draws swing every race
Mario Kart 64 leans clearly harder on optimization.
Alto's Adventure
Goal checklist and combo logic shallow
Mario Kart 64
Shortcut and line knowledge is fully mapped
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.