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

Execution · Twitch Chaos
An endless runner about sprinting down a hospital corridor full of zombies.

Execution · Practiced Mastery
Claustrophobic post-apocalyptic shooter where bullets double as currency.
Corridor Z leans Execution (Twitch Chaos); Metro 2033 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.
Corridor Z
reaction timing to avoid zombie hazards
Metro 2033
scarce-ammo gunfights punish sloppy aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Corridor Z
no opponent, scripted zombie AI
Metro 2033
mutants and bandits follow scripts
Corridor Z leans a little harder on variance, though the gap is small.
Corridor Z
random hazard and item placement
Metro 2033
hidden moral points and supplies first run
Metro 2033 leans a little harder on optimization, though the gap is small.
Corridor Z
minor upgrade and route strategy
Metro 2033
ammo-as-currency economy and stealth routing
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.