[Samba] Real trouble: Unify two tottaly different domains

[melim]

Hello,

I have two tottaly different samba domains, on different networks, only
their names are the same "ISODOMAIN".

Let's call the first ISO1 (version 3 on a fedora core 2) and the second ISO2
(version 3 on a redhat 9.0) to simplify this.
So, I need to bring machines and users from ISO2 to ISO1.
Can anyone give me a way of doing this without losing the user profiles? (IF
there is a way...)