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

Optimization · Pure Optimization
Solving fixed grim puzzles to escape a facility, dexterity-free.

Optimization · Pure Optimization
Comedic point-and-click adventure of Guybrush Threepwood, hand-drawn at its peak.
Cayne leans Optimization (Pure Optimization); The Curse of Monkey Island leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Cayne
Isometric point-and-click, no dexterity
The Curse of Monkey Island
pointing and clicking only
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Cayne
No adaptive threat in the facility
The Curse of Monkey Island
no adaptive opponent
The Curse of Monkey Island leans a little harder on variance, though the gap is small.
Cayne
Story horrors are hidden until uncovered, then static
The Curse of Monkey Island
puzzle solutions unknown on first play, then fixed
The Curse of Monkey Island leans a little harder on optimization, though the gap is small.
Cayne
Solving fixed environmental puzzles drives all progress
The Curse of Monkey Island
inventory logic puzzles are fully 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.