head to head
Kerbal Space Program asks more than No Man's Sky, and the gap is execution.

Optimization · Pure Optimization
Rocket engineering sandbox about orbital mechanics.

Optimization · Pure Optimization
Procedural space exploration sandbox with crafting depth.
Kerbal Space Program leans Optimization (Pure Optimization); No Man's Sky leans Optimization (Pure Optimization).
Kerbal Space Program leans clearly harder on execution.
Kerbal Space Program
Manual piloting, docking precision
No Man's Sky
Light shooter and flight inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kerbal Space Program
No adaptive opponents
No Man's Sky
Mostly solo, sparse PvP
No Man's Sky leans a little harder on variance, though the gap is small.
Kerbal Space Program
Light reentry and physics variance
No Man's Sky
Procedural planets and loot
Kerbal Space Program leans clearly harder on optimization.
Kerbal Space Program
Rocket design, delta-v budget, mission planning
No Man's Sky
Base, freighter, expedition progression
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.