Are any of these servers what you are looking for?

Servers with "Versus" and "L4D2" in the name:
n!faculty L4D2 Versus by www.arcor.de
BwAGaming.com L4D2 Private Super Versus #1
TimetoKill.net - L4D2 10v10 Versus - !buy/!perks
DCUGS: L4D2 Team Versus
DCUGS: L4D2 Realism Versus
DCUGS: L4D2 Versus
OptiZone.RU L4D2 Versus #1 v2.1.2.2
OptiZone.RU L4D2 Versus #3 v2.1.2.2
OptiZone.RU L4D2 Versus #2 v2.1.2.2
[AwesomeSchnitzelServer] L4D2 Scavenge/Versus/Survival