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
A slower 2.5D Kirby built around mixing two copy abilities into inventive combo powers.

Execution · Practiced Mastery
A PS4 launch brawler starring a creature of relics that grows from tiny scrapper to building-sized titan.
Kirby 64: The Crystal Shards leans Execution (Practiced Mastery); Knack 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.
Kirby 64: The Crystal Shards
Relaxed platforming, some tricky shard grabs
Knack
Dodge timing matters as fragile small Knack
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby 64: The Crystal Shards
Fully scripted enemies
Knack
Scripted goblin and robot patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby 64: The Crystal Shards
Shard hiding spots unknown only once
Knack
Relic chest contents vary slightly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby 64: The Crystal Shards
Power-combo crafting solves shard puzzles
Knack
Size mechanics and gadget crafting are simple systems
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.