I assume you mean the zone and zoneset configuration right?
You can go go the san1-a switch and for each VSAN enabled. The config command is 'zoneset distribute full vsan xx'.
Once this is enabled for all VSANs, then on the same san1-a switch, reactivate the currently active zoneset for each VSAN.
This will push the complete zone database (fc-aliases too) to san-1b and it should show up in the config. You need to do this for each VSAN.
Once completed...issue 'copy run start' to save the updated running configuration to NVRAM.
Device-alias is distributed by CFS, so when if configured them on san-1a, when you issued the 'device-alias commit', it should have pushed them over to san-1b.
Not sure that other config statements would need to be moved over.
Hope this helps,
Mike