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.

Execution · Practiced Mastery
Kirby's breezy Game Boy debut, floating and inhaling through five short dreamlike stages.

Execution · Practiced Mastery
A family-tuned brawler-platformer testing modest timing and simple puzzle solutions.
Kirby's Dream Land leans Execution (Practiced Mastery); Knack II leans Execution (Practiced Mastery).
Kirby's Dream Land leans a little harder on execution, though the gap is small.
Kirby's Dream Land
Gentle platforming, harder in Extra Mode
Knack II
Light combo timing and platforming pitched at families
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Dream Land
Bosses loop tiny fixed patterns
Knack II
Enemies run simple scripts without adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Dream Land
Nothing hidden after one loop
Knack II
Levels are fixed with nothing hidden beyond first sight
Kirby's Dream Land leans a little harder on optimization, though the gap is small.
Kirby's Dream Land
Short fixed levels, simple boss study
Knack II
Size-swap puzzles have single obvious solutions
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.