upgrading from redhat 7.1 to 7.3

Like to know if anyone know of a procedure to upgrade a rhl7.1 to rhl
7.3 server.  The old server is being replaced and I'm doing a fresh
install. In other NOS I've used a migration  technique by installing the
new NOS on the new server and use a migration wizard to "push" whatever
I needed from the old server to the new server.  I do not want to do a
in-place upgrade. What I need to know is how do I go about moving the
user accounts and passwords from one server to the other.  
Is it safe to assume that I should either copy the .conf files from old
server and print out information to install in the new.  The only
services running on the old server is:
apache
squid
php
twig (web-based email)
ipchains; this is going to be changed to iptables
cipe; this is going to be changed to FreeSwan, unless I can get a client
to work with CIPE.
sendmail; to be changed to postfix


Thanks for any insight.

-- 
Jon Miller <[email protected]>
MMT Networks Pty Ltd