head to head
Moonlighter asks more than Fallout: New Vegas, and the gap is variance.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.

Optimization · Pure Optimization
Roguelite about raiding dungeons by night and pricing the loot in your shop by day.
Fallout: New Vegas leans Optimization (Pure Optimization); Moonlighter 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.
Fallout: New Vegas
Shooter inputs with VATS assist
Moonlighter
Dodge-heavy dungeon combat
Fallout: New Vegas leans a little harder on reads, though the gap is small.
Fallout: New Vegas
Scripted factions and enemies
Moonlighter
Enemies are scripted patterns
Moonlighter leans clearly harder on variance.
Fallout: New Vegas
Some loot and crit RNG
Moonlighter
Random dungeon layouts and loot rolls
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
Moonlighter
Price discovery and shop economy are the real 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.