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
A family-tuned brawler-platformer testing modest timing and simple puzzle solutions.

Optimization · Practiced Mastery
A relaxed collect-athon testing character-ability matching far more than any skill ceiling.
Knack II leans Execution (Practiced Mastery); LEGO Batman 2: DC Super Heroes leans Optimization (Practiced Mastery).
Knack II leans a little harder on execution, though the gap is small.
Knack II
Light combo timing and platforming pitched at families
LEGO Batman 2: DC Super Heroes
Button-mashing combat designed for children's hands
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
LEGO Batman 2: DC Super Heroes
Enemies are harmless scripted waves
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
LEGO Batman 2: DC Super Heroes
Stud and minikit locations are fixed once known
LEGO Batman 2: DC Super Heroes leans a little harder on optimization, though the gap is small.
Knack II
Size-swap puzzles have single obvious solutions
LEGO Batman 2: DC Super Heroes
Matching character abilities to gated collectibles
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.