Hi Kier,
If CUCM is installed on MCS server then, u do not need to re-host the license.
But if it is installed on VM, then u need to re-host licenses.
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cups/8_0/english/op_system/administration/guide/cupopsys/iptpch4.html
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/install/8_0_2/install/cmins802.html#wp584709
regds,
aman