Hello,
Your current SIM version is no longer supported. I would advise to install fresh 7.5 on the new machine and start from there.
Switching from one domain to another with SIM is not supported.
http://h20565.www2.hpe.com/hpsc/doc/public/display?docId=c04765244
Page 6
I would just create a host file from the old system then add it to the new one so you can discover all the old devices to the new one.
http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c01041641&sp4ts.oid=489496
