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 · Systems & Chaos
Trial-and-error survival through scripted horror events that memorisation defuses.

Optimization · Systems & Chaos
Puzzle adventure about coaxing a giant half-tame creature through ancient ruins.
Mogeko Castle leans Optimization (Systems & Chaos); The Last Guardian leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mogeko Castle
Occasional chase sequences need only basic movement
The Last Guardian
Slow climbing and platforming, very forgiving
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mogeko Castle
Pursuers are scripted horrors, not adaptive minds
The Last Guardian
Trico is willful but not modeling you adversarially
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mogeko Castle
Deaths come from unknown-until-triggered scripted events
The Last Guardian
Trico's unpredictable compliance adds noise
The Last Guardian leans a little harder on optimization, though the gap is small.
Mogeko Castle
Trial-and-error route knowledge solves the castle completely
The Last Guardian
Environmental puzzles with intended solutions
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.