head to head
Naughty Bear asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
Optimising terror combos against scripted victims to maximise a points score per level.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Naughty Bear leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans a little harder on execution, though the gap is small.
Naughty Bear
Simple melee and chase inputs with low timing demands
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Naughty Bear
Victim bears run scripted panic routines, never modelling you
Portal
No adversary modeling player.
Naughty Bear leans clearly harder on variance.
Naughty Bear
Bear patrols add mild unpredictability per attempt
Portal
Deterministic chambers; no randomness.
Portal leans a little harder on optimization, though the gap is small.
Naughty Bear
Maximising scare-point combos per level is a solvable puzzle
Portal
Pure puzzle-solving optimization.
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.