OK so the Security Policy is held on the Managment Server so that doesn't migrate.
What looking at is extracting the Gaia OS config and importing onto the new Box
You can use the show configuration command to display the current Gaia OS configuration from the unit.
You can take that output and place into a text file
Then edit the configuration to reflect the new Appliances Interface Names. Don't know your current model so may not use the same interface names
You can then paste the file contents into the 5600 after running through the initial config wizard. This should get your interfaces and routes into the box,
Obviously this only takes the Gaia Config so will need to look at other files that may have been modified
$FWDIR/boot/modules/fwkern.conf - kernel paramaters
$FWDIR/conf/trac_client_1.ttm - remote access client
Are the ones that I usually find the need to look at, again, probably worth checking the contents of all of these. They may or may not exist in your environment. Certainly the last 4 which are for RSA SecurID for instance.
Other people may be able to add other files to look at,
Can then establish SIC, license and push policy