Hi Gordon
I think that there are two issues here; the database state and the extension lengths....
The SARK database is always installed at release 1.0.0, irespective of which sail release you put up. There is a directory (/opt/sark/amacs) which contains all of the database updates from each release (they are in files named rnnnn where nnnn is the svn commit number). It should be safe to apply the updates to the database at any time. Each time you install a release of sail the updates will be automatically applied, however, if you revert to a backup from an older release then you should manually apply them by doing
sh /opt/sark/scripts/update_db.sh
This should bring your database into line with your release.
The analogue extensions are generated in sark by parsing /etc/dahdi-channels.conf (which gets generated by a Digium routine called dahdi_genconf). dahdi_genconf is controlled by the settings in /etc/dahdi/genconf_parameters (which you can access through the PCI Card panel in sark). One of the parameters in there controls the extension start number for creating analogue extensions (the default is 4000). By setting that and doing a regen (in PCI Cards) you should be able to achieve the desired objective.
Kind Regards
S