head to head
Left 4 Dead 2 asks more than Resident Evil Revelations 2, and the gap is reads.

Execution · Practiced Mastery
Co-op zombie shooter with adaptive AI Director.

Optimization · Practiced Mastery
Episodic survival horror pairing scarce-resource tension with co-op character switching.
Left 4 Dead 2 leans Execution (Practiced Mastery); Resident Evil Revelations 2 leans Optimization (Practiced Mastery).
Left 4 Dead 2 leans a little harder on execution, though the gap is small.
Left 4 Dead 2
Headshots under horde pressure need aim
Resident Evil Revelations 2
Aiming under pressure and dodge timing against enemies.
Left 4 Dead 2 leans clearly harder on reads.
Left 4 Dead 2
Versus special-infected ambushes have reads
Resident Evil Revelations 2
Scripted enemies and co-op partner; no adaptive opposition.
Left 4 Dead 2 leans a little harder on variance, though the gap is small.
Left 4 Dead 2
AI Director randomizes spawns and items
Resident Evil Revelations 2
First-run scares, unknown layouts, raid mode loot rolls.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Left 4 Dead 2
Route knowledge and weapon picks solvable
Resident Evil Revelations 2
Resource routing, enemy spawn knowledge, episode mastery once mapped.
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.