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

Optimization · Practiced Mastery
A gentle Hogwarts exploration checklist with minimal skill demands anywhere.

Optimization · Practiced Mastery
An easygoing co-op Kirby about recruiting enemies as friends and combining their elemental powers.
Harry Potter and the Order of the Phoenix leans Optimization (Practiced Mastery); Kirby Star Allies leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Harry Potter and the Order of the Phoenix
Spell-casting gestures are deliberately easy
Kirby Star Allies
Very low difficulty, AI allies carry fights
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Harry Potter and the Order of the Phoenix
Scripted students and Umbridge plots, no adaptive foe
Kirby Star Allies
Friend AI helps rather than opposes
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Harry Potter and the Order of the Phoenix
Hogwarts is fixed; discovery is one-time
Kirby Star Allies
Fixed layouts and bosses
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Harry Potter and the Order of the Phoenix
Navigating the castle and task checklist is the game
Kirby Star Allies
Friend-ability element combos solve puzzles
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.