postupgrade?

[Bruno Wolff III]

On Fri, May 13, 2011 at 14:05:46 -0400,
  Tom Horsley <horsley1953 at gmail.com> wrote:
> So, is there anything like a "postupgrade" tool that would
> be sort of the inverse of "preupgrade" that can automate
> picking the rpms I need to install to make a new fedora
> install as much like an older one as possible? (substituting
> new tools and artwork for old where appropriate)

Get the list of packages from the previous install and try to install ones that
are installed on the current system. If any are obsoleted, whatever obsoletes
them should get installed.