head to head
Portal 2 asks more than Endless Fables 2: Frozen Path, and the gap is execution.

Optimization · Pure Optimization
A hidden-object adventure about solving fixed puzzles to follow a Norse mystery.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Endless Fables 2: Frozen Path leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Endless Fables 2: Frozen Path
Point-and-click and hidden-object hunting, no dexterity
Portal 2
Portal placement requires some precision but timing is lenient.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Endless Fables 2: Frozen Path
No adaptive opponent in solo adventure
Portal 2
No opponent; puzzles are static.
Endless Fables 2: Frozen Path leans a little harder on variance, though the gap is small.
Endless Fables 2: Frozen Path
Puzzles and scenes are fixed
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans clearly harder on optimization.
Endless Fables 2: Frozen Path
Solving inventory puzzles and finding objects is the loop
Portal 2
Solving the puzzle's logic IS the entire game.
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.