head to head
Factorio asks more than The Elder Scrolls V: Skyrim, and the gap is optimization.

Optimization · Pure Optimization
A factory-engineering sandbox about scaling throughput against your own bottlenecks.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Factorio leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans a little harder on execution, though the gap is small.
Factorio
Some APM in early hand-crafting; otherwise irrelevant.
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Factorio
Biters follow fixed pollution rules; no adaptive opponent.
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
The Elder Scrolls V: Skyrim leans a little harder on variance, though the gap is small.
Factorio
Resource patch placement adds minor map randomness.
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Factorio leans clearly harder on optimization.
Factorio
Throughput, ratios, and logistics are the entire game.
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits are deeply solvable.
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.