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

Optimization · Practiced Mastery
A four-player Wii Kirby romp gathering ship parts for the stranded alien Magolor.

Optimization · Practiced Mastery
A low-pressure co-op romp that mostly tests patience for collectible completion.
Kirby's Return to Dream Land leans Optimization (Practiced Mastery); LEGO Star Wars III: The Clone Wars leans Optimization (Practiced Mastery).
Kirby's Return to Dream Land leans a little harder on execution, though the gap is small.
Kirby's Return to Dream Land
Easygoing main game; EX mode adds modest demands
LEGO Star Wars III: The Clone Wars
Forgiving combat and platforming with infinite respawns
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Return to Dream Land
Bosses are pattern-scripted
LEGO Star Wars III: The Clone Wars
Scripted droid armies never adapt to you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Return to Dream Land
Energy sphere hiding spots are static secrets
LEGO Star Wars III: The Clone Wars
Stud and brick placements are fixed once seen
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Return to Dream Land
Super ability timing and sphere collection are solvable
LEGO Star Wars III: The Clone Wars
Collectible routing and character unlocks are the only real puzzle
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.