...It is not an official recommendation to do so as packages have their version number for a reason!
I personally have been ignoring RPM versions for years and have not been into any trouble because of that.
Usually you'd want to use the script as: sudo ./pkg_version-zypper.rb -f '<' -r -u
But you can also take package versions into account: sudo ./pkg_version-zypper.rb -f '<' -r -u -p