The ZETA6104 is a drop-in replacement for the OEMZL6104. It has the same dimensions, dipswitches, connectors and uses the same software.
ZETA6104 and OEMZL6104 capabilities
The ZETA6104 and OEMZL6104 are almost the same in capability. The OEMZL6104 does not have Active Damping, Electronic Viscosity, or Following capabilities.