head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Optimization · Pure Optimization
RTS where you splice animals into custom armies before battle begins.

Optimization · Pure Optimization
Managing galactic economy and fleet counters, with prediction mattering against humans.
Impossible Creatures leans Optimization (Pure Optimization); Star Wars: Empire at War leans Optimization (Pure Optimization).
Impossible Creatures leans a little harder on execution, though the gap is small.
Impossible Creatures
Standard RTS micro and army control
Star Wars: Empire at War
Some battle micro, but APM never dominates outcomes
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Impossible Creatures
Human opponents counter your creature picks
Star Wars: Empire at War
Multiplayer galactic feints and fleet composition mind-games matter
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Impossible Creatures
Scouting hidden enemy combinations
Star Wars: Empire at War
Fog of war hides enemy fleets until scouted
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Impossible Creatures
Creature-combining army design is deeply solvable
Star Wars: Empire at War
Economy, tech order and counter-unit composition decide campaigns
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.