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

Execution · Pure Mechanics
Flawless execution of memorised patterns under one-hit-death pressure.

Execution · Pure Mechanics
A first-person cyberpunk slasher where everything dies in one hit, including you.
Contra 4 leans Execution (Pure Mechanics); Ghostrunner leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Contra 4
One-hit deaths under dense bullet patterns demand near-perfect inputs
Ghostrunner
One-hit-death parkour and slashing demand near-perfect inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Contra 4
Every enemy and boss is a fixed script
Ghostrunner
Enemy placements are fixed
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Contra 4
Spawns and patterns are identical every run
Ghostrunner
Deterministic levels
Ghostrunner leans a little harder on optimization, though the gap is small.
Contra 4
Memorising layouts and weapon routing enables the execution
Ghostrunner
Route planning and enemy-order solutions define fast clears
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.