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 · Pure Mechanics
A by-the-numbers cover shooter testing only modest aim.

Execution · Practiced Mastery
A short graphics showcase testing basic shooter execution for twenty minutes.
Eat Lead: The Return of Matt Hazard leans Execution (Pure Mechanics); Half-Life 2: Lost Coast leans Execution (Practiced Mastery).
Eat Lead: The Return of Matt Hazard leans a little harder on execution, though the gap is small.
Eat Lead: The Return of Matt Hazard
Cover-shooter aim with generous margins
Half-Life 2: Lost Coast
A short stretch of standard Half-Life 2 gunplay
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Eat Lead: The Return of Matt Hazard
Parody enemies follow obviously scripted waves
Half-Life 2: Lost Coast
A handful of scripted Combine soldiers
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Eat Lead: The Return of Matt Hazard
Set pieces never change
Half-Life 2: Lost Coast
One fixed level with nothing hidden
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Eat Lead: The Return of Matt Hazard
Little to solve beyond weapon pickups
Half-Life 2: Lost Coast
Too brief to develop any systems layer
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.