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
Quiet side-scrolling journey piloting a land-ship across a dried-out sea.

Optimization · Practiced Mastery
A relaxed co-op collect-a-thon testing little beyond completionist routing.
FAR: Lone Sails leans Optimization (Pure Optimization); LEGO Pirates of the Caribbean: The Video Game leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
FAR: Lone Sails
Light platforming and timely lever pulls
LEGO Pirates of the Caribbean: The Video Game
Forgiving brawling and platforming for all ages
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FAR: Lone Sails
No opponent of any kind
LEGO Pirates of the Caribbean: The Video Game
Enemies are harmless scripted props
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FAR: Lone Sails
Mostly fixed obstacles, minor unknowns first run
LEGO Pirates of the Caribbean: The Video Game
Collectible locations are fixed, just initially unknown
FAR: Lone Sails leans a little harder on optimization, though the gap is small.
FAR: Lone Sails
Fuel management and ship-routine efficiency are the game
LEGO Pirates of the Caribbean: The Video Game
Completionist collectible routing is the only real puzzle
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.