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
A timed perception test of finding hidden objects in cluttered crime scenes.

Execution · Practiced Mastery
An early top-down rampage shooter with simple execution demands.
Criminal Case leans Execution (Twitch Chaos); Postal 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.
Criminal Case
Spotting objects quickly under a timer is the whole test
Postal
top-down shooting and movement
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Criminal Case
No opponent; suspects are static puzzle pieces
Postal
enemies use fixed aggressive scripts
Criminal Case leans a little harder on variance, though the gap is small.
Criminal Case
Object placements are unknown per scene until memorised
Postal
enemy spawn and pathing randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Criminal Case
Scene layouts converge to memorised positions on replays
Postal
weapon choice and route clearing
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.