head to head
Papers, Please asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
Dystopian border-checkpoint sim where stamping passports fast enough feeds your family.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Papers, Please leans Optimization (Pure Optimization); Portal 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.
Papers, Please
Document-checking speed directly pays the rent
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.
Papers, Please
Entrants are generated, not adaptive opponents
Portal
No adversary modeling player.
Papers, Please leans clearly harder on variance.
Papers, Please
Random entrant documents and scripted-event surprises
Portal
Deterministic chambers; no randomness.
Portal leans a little harder on optimization, though the gap is small.
Papers, Please
Internalizing rulebooks and inspection workflow efficiency
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.