head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

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

Execution · Twitch Chaos
Kart-racing control with item RNG swinging family-friendly races.
Crash Bash leans Execution (Competitive PvP); F1 Race Stars 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
F1 Race Stars
Kart handling and boost timing decide clean laps
Crash Bash leans a little harder on reads, though the gap is small.
Crash Bash
Human rivals in versus minigames can be baited
F1 Race Stars
Human racers feint and time item attacks in multiplayer
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Crash Bash
Item drops and arena randomness swing rounds
F1 Race Stars
Item rolls swing positions like any kart racer
F1 Race Stars leans a little harder on optimization, though the gap is small.
Crash Bash
Light minigame strategies, quickly learned
F1 Race Stars
Track shortcuts and KERS timing are learnable edges
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.