.tar.gz is probably a source tarball you have to compile yourself. In this case, you will probably end up having both bind versions or something similar.
To keep your RH installation consistent, you should use Red Hat rpm packages.
Get Red Hat security patches automagically by using up2date or look at www.redhat.com/errata
If there is no update for bind available, there are two possibilities:
- Red Hat has patched their stock version of bind with the fixes already
- Red Hat has no fix available (should not happen)
To get newer versions, you can also look at www.rpmfind.net
Addendum (few minutes later ... ;-)
I oversaw that you are using RH 7.3 which is no longer supported.
In fact, none of the "normal" Red Hat Version are, except RH9, which expires in March.
Try to get a bind rpm elsewhere (e.g. as I said on rpmfind).
You should consider upgrading to either Fedora or Red Hats (expensive) "high end" products - or switch to Debian (which is what I did)