Hello SkeletorFJR1300,
Thank you for posting in Microsoft Community forum.
Yes, you can move your Windows Server 2019 installation to a different machine. However, you will need to deactivate the license on the current machine before activating it on the new machine. To do this, go to Settings > Update & Security > Activation on the current machine and select "Deactivate". Once you have done this, you can install Windows Server 2019 on the new machine and activate it using the same license key.
Regarding the change in IP address and MAC address, this should not affect the activation of your license. However, if you have any applications or services that are tied to the old IP address or MAC address, you may need to update their configurations accordingly.
I hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Haijian Shan