head to head
Crash Team Racing asks more than Mario Kart: Double Dash!!, and the gap is optimization.

Execution · Practiced Mastery
Kart racer whose boost-chaining drift system gives it a real execution ceiling.

Execution · Twitch Chaos
GameCube kart racer with two riders per kart trading items mid-drift.
Crash Team Racing leans Execution (Practiced Mastery); Mario Kart: Double Dash!! 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.
Crash Team Racing
Boost-chaining and drift timing separate skill tiers
Mario Kart: Double Dash!!
Two-character swaps and drift timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Crash Team Racing
Human races involve item baiting and blocking
Mario Kart: Double Dash!!
Item duels against humans reward baiting
Mario Kart: Double Dash!! leans a little harder on variance, though the gap is small.
Crash Team Racing
Item box rolls swing positions
Mario Kart: Double Dash!!
Special item rolls swing races
Crash Team Racing leans clearly harder on optimization.
Crash Team Racing
Shortcut routes and reserve-boost technique
Mario Kart: Double Dash!!
Character pairings and lines are solved
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.