head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Pure Mechanics
A PS4-era Killzone where a Shadow Marshal and his OWL drone fight through a divided Helghast city.

Execution · Practiced Mastery
N64 spy FPS famed for gadget-heavy missions and bot-filled multiplayer.
Killzone Shadow Fall leans Execution (Pure Mechanics); Perfect Dark 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.
Killzone Shadow Fall
Standard FPS aim and movement ceiling
Perfect Dark
N64 manual aim and tight mission play
Killzone Shadow Fall leans a little harder on reads, though the gap is small.
Killzone Shadow Fall
PvP modes reward predicting human players
Perfect Dark
Multiplayer and clever sims add some human-style adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Killzone Shadow Fall
Some open level routes and spawn noise
Perfect Dark
Mission scripting fixed once learned
Perfect Dark leans a little harder on optimization, though the gap is small.
Killzone Shadow Fall
OWL drone usage and loadouts optimize cleanly
Perfect Dark
Objective routing on harder difficulty tiers
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.