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 · Practiced Mastery
An early top-down rampage shooter with simple execution demands.

Execution · Practiced Mastery
An open-world crime game where combat combos and driving skill carry the action.
Postal leans Execution (Practiced Mastery); Sleeping Dogs leans Execution (Practiced Mastery).
Sleeping Dogs leans a little harder on execution, though the gap is small.
Postal
top-down shooting and movement
Sleeping Dogs
brawling and driving need timing/aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Postal
enemies use fixed aggressive scripts
Sleeping Dogs
scripted enemy AI, no adaptation
Postal leans a little harder on variance, though the gap is small.
Postal
enemy spawn and pathing randomness
Sleeping Dogs
minor loot and traffic randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Postal
weapon choice and route clearing
Sleeping Dogs
upgrade paths and mission routes solvable
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.