head to head
Mario Kart: Double Dash!! asks more than Re-Volt, and the gap is reads.

Execution · Twitch Chaos
GameCube kart racer with two riders per kart trading items mid-drift.

Execution · Pure Mechanics
A radio-controlled car racer through houses and supermarkets with weapon pickups and hidden shortcuts.
Mario Kart: Double Dash!! leans Execution (Twitch Chaos); Re-Volt leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart: Double Dash!!
Two-character swaps and drift timing
Re-Volt
Twitchy RC car handling punishes sloppy steering
Mario Kart: Double Dash!! leans clearly harder on reads.
Mario Kart: Double Dash!!
Item duels against humans reward baiting
Re-Volt
Multiplayer item duels add a thin mind-game layer
Mario Kart: Double Dash!! leans a little harder on variance, though the gap is small.
Mario Kart: Double Dash!!
Special item rolls swing races
Re-Volt
Random pickups swing race outcomes
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Kart: Double Dash!!
Character pairings and lines are solved
Re-Volt
Shortcuts and car-class knowledge reward 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.