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.

Execution · Light / Casual
A joke shooter testing little beyond willingness to laugh along.

Execution · Practiced Mastery
An early top-down rampage shooter with simple execution demands.
GentleMoon 2 leans Execution (Light / Casual); Postal leans Execution (Practiced Mastery).
Postal leans a little harder on execution, though the gap is small.
GentleMoon 2
Basic aiming at slow zombies, nothing demanding
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.
GentleMoon 2
Joke enemies follow simple scripts
Postal
enemies use fixed aggressive scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
GentleMoon 2
Item locations are unknown on a first run only
Postal
enemy spawn and pathing randomness
Postal leans a little harder on optimization, though the gap is small.
GentleMoon 2
A short fixed checklist of items to collect
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.