From what I know I would say no ! I have no machine to test this. However if somebody is able to provide the relevant files I would be happy to update the contrib the way I did for the shadow file.
from what I understand there is something to do with
/etc/samba/smbpasswd
/etc/samba/schannel_store.tdb
/etc/samba/secrets.tdb
not sure however if machine accounts get their way in accounts e-smith db or in shadow but I would say no.
I would say however that just copying those files should be enough, and might also be necessary.
Were you able to log in with samba without copying those files ?