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.

Optimization · Pure Optimization
Solving fixed item-combination puzzles inside a dark comic story.

Optimization · Pure Optimization
A comedic point-and-click adventure of pirate puzzles with fixed solutions.
Edna & Harvey: Harvey's New Eyes leans Optimization (Pure Optimization); Escape from 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.
Edna & Harvey: Harvey's New Eyes
Pointing and clicking has no dexterity ceiling
Escape from Monkey Island
Pointing and walking only
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Edna & Harvey: Harvey's New Eyes
Characters are scripted comedy props
Escape from Monkey Island
No opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Edna & Harvey: Harvey's New Eyes
Solutions are hidden until discovered once
Escape from Monkey Island
Puzzle solutions hidden until discovered
Escape from Monkey Island leans a little harder on optimization, though the gap is small.
Edna & Harvey: Harvey's New Eyes
Item-combination logic puzzles have single fixed answers
Escape from Monkey Island
Once known, every puzzle has one fixed answer
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.