head to head
Fallout: New Vegas asks more than Amnesia: Rebirth, and the gap is execution.

Optimization · Pure Optimization
A narrative horror game tested primarily by puzzle knowledge and sanity-resource management.

Optimization · Pure Optimization
A faction-driven RPG-shooter where build and route planning shape every ending.
Amnesia: Rebirth leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Fallout: New Vegas leans clearly harder on execution.
Amnesia: Rebirth
Stealth and evasion; no real twitch demands
Fallout: New Vegas
Shooter inputs with VATS assist
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Amnesia: Rebirth
Enemies patrol fixed routes; no adaptive opponent
Fallout: New Vegas
Scripted factions and enemies
Amnesia: Rebirth leans a little harder on variance, though the gap is small.
Amnesia: Rebirth
Some encounter timing has variance; story rooms are fixed
Fallout: New Vegas
Some loot and crit RNG
Fallout: New Vegas leans a little harder on optimization, though the gap is small.
Amnesia: Rebirth
Resource management, narrative puzzles and safe-path knowledge are solvable
Fallout: New Vegas
Faction routing, perks, builds heavily rewarded
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.