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.

Optimization · Pure Optimization
A hidden-object adventure about solving fixed environmental and inventory puzzles.

Optimization · Pure Optimization
A prank-based puzzle game about sequencing traps against a scripted neighbor.
Lost Lands: Dark Overlord leans Optimization (Pure Optimization); Neighbours from Hell 2: On Vacation leans Optimization (Pure Optimization).
Neighbours from Hell 2: On Vacation leans a little harder on execution, though the gap is small.
Lost Lands: Dark Overlord
Point-and-click; no timing or aim demands
Neighbours from Hell 2: On Vacation
light timing on trap execution
Neighbours from Hell 2: On Vacation leans a little harder on reads, though the gap is small.
Lost Lands: Dark Overlord
Solo with no adaptive adversary
Neighbours from Hell 2: On Vacation
neighbor follows scripted routine, not adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Lost Lands: Dark Overlord
Hidden objects and clues unknown until found
Neighbours from Hell 2: On Vacation
some randomness in reaction timing
Lost Lands: Dark Overlord leans a little harder on optimization, though the gap is small.
Lost Lands: Dark Overlord
Solving fixed inventory puzzles is the entire game
Neighbours from Hell 2: On Vacation
puzzle-solving trap sequences per room
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.