@MarcP is correct.
- Just remove the MX65W from the network using this button on the Appliance status page:
- Then add the MX65 to the network. It should automatically get the old settings, except for a few:
"Please note that the network will retain the old MX's non-local configuration, so the replacement MX does not need to be reconfigured in Dashboard. To remove an MX from an existing network, follow the steps below."
That means the following:
"Regardless of which method is used, any local settings such as static WAN IP addresses, proxies, and non-standard link speeds will need to be configured manually on the Local Status Page before the MX can connect to Dashboard. Generally these should be copied from the original MX (if available)."
There's actually an article specifically for this task:
https://documentation.meraki.com/MX/Other_Topics/MX_Cold_Swap_Replacing_an_Existing_MX_with_a_Differ...