head to head
Napoleon: Total War asks more than Portal 2, and the gap is reads.

Optimization · Pure Optimization
Grand strategy and line-infantry battles across the Napoleonic Wars.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Napoleon: Total War leans Optimization (Pure Optimization); Portal 2 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.
Napoleon: Total War
Real-time battle micro under pressure
Portal 2
Portal placement requires some precision but timing is lenient.
Napoleon: Total War leans clearly harder on reads.
Napoleon: Total War
Multiplayer battles involve feints; campaign AI is mappable
Portal 2
No opponent; puzzles are static.
Napoleon: Total War leans clearly harder on variance.
Napoleon: Total War
Morale swings and fog of war
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Napoleon: Total War
Campaign economy, army composition, and line tactics
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.