Certain config items will be persistent when swapping MX/Z devices and others will need to be re-added. Some examples of configurations that will remain:
- Subnets/static routes
- Global Bandwidth limits & traffic shaping
- L3 firewall rules
Other items like AutoVPN will need to be reconfigured, as well as any features available on the 68CW not available on the Z1 (content filtering, Threat Protection, port settings, etc).