To move the DHCP Data from one server to the other
Open an Elevated Command Prompt
Type: netsh dhcp server export c:\dhcp.txt all
Move the dhcp.txt file to the new server.
Type netsh dhcp server import c:\dhcp.txt all
If you server was not previously authorized you may need to authorize it.
Once you start the DHCP service on a the new server you should disable and stop the service on the old server so they do not conflict. If you are changing your DNS server as well you should change the DNS server info in all of the DHCP scope options.