head to head
Mario Kart 64 asks more than Crash Bash, and the gap is optimization.

Execution · Competitive PvP
A Crash Bandicoot party collection of competitive arena minigames for up to four players.

Execution · Twitch Chaos
N64 couch classic where blue shells and shortcuts decide friendships.
Crash Bash leans Execution (Competitive PvP); 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.
Crash Bash
Minigame timing, mashing, and dodging decide most rounds
Mario Kart 64
Mini-turbo snaking and shortcut execution
Crash Bash leans a little harder on reads, though the gap is small.
Crash Bash
Human rivals in versus minigames can be baited
Mario Kart 64
Couch rivals bait shells and fakes
Mario Kart 64 leans a little harder on variance, though the gap is small.
Crash Bash
Item drops and arena randomness swing rounds
Mario Kart 64
Item draws swing every race
Mario Kart 64 leans clearly harder on optimization.
Crash Bash
Light minigame strategies, quickly learned
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.