When you export and import a virtual machine (VM) in Hyper-V, the virtual network configuration is preserved, but the specific IP address must be reconfigured, the Generation is preserved, and the configuration version depends on the target host's compatibility, as the new host may create a newer version of the VM configuration file. The export includes the VM's identity and configuration, while the import process allows you to reconfigure network and other settings to match the new host's environment.
Reference:
https://learn.microsoft.com/en-us/windows-server/virtualization/hyper-v/deploy/export-and-import-virtual-machines