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
A turn-based 4X strategy game about optimizing civilization growth and tech trees over centuries.

Optimization · Pure Optimization
Map-painting grand strategy ruled by mana and idea optimization.
Call to Power II leans Optimization (Pure Optimization); Europa Universalis IV leans Optimization (Pure Optimization).
Europa Universalis IV leans a little harder on execution, though the gap is small.
Call to Power II
none, purely turn-based decisions
Europa Universalis IV
pausable, no twitch
Europa Universalis IV leans a little harder on reads, though the gap is small.
Call to Power II
limited prediction of AI civ behavior
Europa Universalis IV
AI mostly scripted, some MP
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call to Power II
random events and combat outcome rolls
Europa Universalis IV
events, mission paths
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call to Power II
deep civilization-building and tech optimization
Europa Universalis IV
idea groups, economy, mana spending
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.