head to head
Mario Kart World asks more than Blur, and the gap is variance.

Execution · Pure Mechanics
Arcade racing with Mario Kart-style power-ups bolted onto licensed cars.

Execution · Twitch Chaos
Kart racing blending drift execution with item RNG and pack positioning.
Blur leans Execution (Pure Mechanics); Mario Kart World leans Execution (Twitch Chaos).
Blur leans a little harder on execution, though the gap is small.
Blur
Racing lines and dodging shots demand car control
Mario Kart World
Drift charging, rail grinding and shortcut precision reward hands
Mario Kart World leans a little harder on reads, though the gap is small.
Blur
Human racers bait and time power-ups against you
Mario Kart World
Human racers bait items and contest lines in knockouts
Mario Kart World leans clearly harder on variance.
Blur
Power-up pickups and incoming attacks add chaos
Mario Kart World
Item rolls and rubber-banding scramble any single race
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Blur
Track knowledge and pickup routes are learnable
Mario Kart World
Course knowledge, shortcuts and item management converge with study
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.