Zomb 4 is the fourth Zombie headsculpt design for the Adventure Kartel Zomb figures. At this time, the only figure released with a Zomb 4 head sculpt is Blind Oracle Zomb, whose head is also featured (severed) as an accessory with each Fighting JC variant. It is possible that we may see a wider release of the Zomb 4 head type.
Zomb head sculpts
A list of Zombie head sculpts: