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
Reverse-horror metroidvania where you play the escaped flesh monster.

Optimization · Practiced Mastery
Routing an ever-growing ball through fixed object layouts against the clock.
Carrion leans Optimization (Practiced Mastery); Katamari Damacy Reroll 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.
Carrion
Fluid tentacle movement and snatch timing
Katamari Damacy Reroll
Tank-control rolling under time pressure takes coordination
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Carrion
Guards follow simple fixed behaviours
Katamari Damacy Reroll
No opponents, just cluttered scripted playgrounds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Carrion
Layouts and encounters are fixed
Katamari Damacy Reroll
Object layouts are fixed every attempt
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Carrion
Route memory and biomass upgrade puzzles
Katamari Damacy Reroll
Growth-route planning through object size tiers drives scores
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.