head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Charming physics toy about a wobbly robot climbing a giant plant into the sky.

Execution · Practiced Mastery
A family-tuned brawler-platformer testing modest timing and simple puzzle solutions.
Grow Home leans Execution (Practiced Mastery); Knack II 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.
Grow Home
Procedural hand-over-hand climbing coordination
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.
Grow Home
No opposition of any kind
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.
Grow Home
World fixed; little hidden
Knack II
Levels are fixed with nothing hidden beyond first sight
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grow Home
Vine routing toward floating islands
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.