Hi,
this has no effect at all since the Machine registration is not tied to the hostname it is handled via a unique ID on the OS which is generated during installtion (All client OS use the same method).
The information will be even updated in the Advanced Screen in Bootguard (this issue got solved 10.1.x I believe)
So with the next policy sync the Universal / SEMS should update and also after the next reboot Bootguard should have the updated informaiton.