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

Execution · Practiced Mastery
A family-tuned brawler-platformer testing modest timing and simple puzzle solutions.

Execution · Practiced Mastery
A dark puzzle-platformer about a tiny girl in a grotesque world.
Knack II leans Execution (Practiced Mastery); Little Nightmares leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Knack II
Light combo timing and platforming pitched at families
Little Nightmares
Stealth platforming demands timing.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Knack II
Enemies run simple scripts without adaptation
Little Nightmares
Enemies are scripted.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Knack II
Levels are fixed with nothing hidden beyond first sight
Little Nightmares
Minimal randomness.
Little Nightmares leans a little harder on optimization, though the gap is small.
Knack II
Size-swap puzzles have single obvious solutions
Little Nightmares
Routes have fixed 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.