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.

Optimization · Light / Casual
A first-person horror about exploring a haunted Prussian castle.

Execution · Light / Casual
A comedy sandbox testing nothing harder than enthusiasm for collateral damage.
Amnesia: The Dark Descent leans Optimization (Light / Casual); Kill It With Fire leans Execution (Light / Casual).
Kill It With Fire leans a little harder on execution, though the gap is small.
Amnesia: The Dark Descent
Stealth and hiding, low demand.
Kill It With Fire
Swatting spiders needs only loose aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Amnesia: The Dark Descent
Monsters follow scripted patrols.
Kill It With Fire
Spiders scuttle on simple RNG, no minds here
Kill It With Fire leans a little harder on variance, though the gap is small.
Amnesia: The Dark Descent
Minor encounter variation.
Kill It With Fire
Spider hiding spots are unknown until flushed out
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Amnesia: The Dark Descent
Oil and sanity management is shallow.
Kill It With Fire
Checklist objectives and weapon unlocks, deliberately shallow
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.