head to head
Disney's DuckTales: The Quest for Gold asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
A money-making strategy game about routing investments and treasure hunts efficiently.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Disney's DuckTales: The Quest for Gold 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.
Disney's DuckTales: The Quest for Gold
Flight minigame timing matters but is light
Portal
Portal placement timing modest.
Disney's DuckTales: The Quest for Gold leans a little harder on reads, though the gap is small.
Disney's DuckTales: The Quest for Gold
No adaptive opponent, AI rivals are scripted
Portal
No adversary modeling player.
Disney's DuckTales: The Quest for Gold leans clearly harder on variance.
Disney's DuckTales: The Quest for Gold
Treasure locations and events add randomness
Portal
Deterministic chambers; no randomness.
Portal leans a little harder on optimization, though the gap is small.
Disney's DuckTales: The Quest for Gold
Managing cash, investments and route is the core loop
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.