Have you read this?
*.rpmnew files are unmodified configuration files from an update, which didn't
replace an existing modified configuration file. It is generally safe to remove *.rpmnew files, unless, the new configuration files contains added options that need to be configured over previous version configuration file. In which case, merging the two would seem to be the best choice.
*.rpmsave configuration files are copies of the older version config file, which was replaced with the updated config file. Chances are high that you don't need those in most cases either. All of the *.rpmnew and *.rpmsave files should be found somewhere under the /etc/ directory. There are no configuration files from an update that are suffixed with ".rpm". *.rpm files are rpm package files.