FortigateVM serial changed after factory reset , Attempting to make a cluster.

[Simon_Bingham]

This is lab work. I'm clustering 2 VM to simulate a customer environment. I have some 60day licenses of FG
When I bring them together, they do not sync due to some config differences on the new unit ( dns and a few interfaces ).

1) is the a way to force the established unit just to overwrite the new one ?
2) In accordance with FortiGate's guidelines, I factory defaulted the new unit, but at this point, the serial number changed and the licence was lost. Any attempt to restore the licence now fails ( probably as a result of the new serial number ).  
Any guidance on how I can progress is much appreciated. 

FortiGate-VM64-KVM # execute ping service.fortiguard.net
PING guard.fortinet.net (208.184.237.61): 56 data bytes
64 bytes from 208.184.237.61: icmp_seq=0 ttl=45 time=146.8 ms

Requesting FortiCare license token:xxxxxxxxxxxxxxxxxx proxy:(null)
Forticare response error 58.
Failed to download VM license.