How to replace a repository on CentOS while keeping the software?

Question

linux

I wanted to update the software on the server with CentOS, I started to deal with the repositories. rpmforge and atomic have been installed. I listened to the authors https://wiki.centos.org/AdditionalResources/Reposi... and decided to switch to epel and IUS. I first removed all the software installed via rpmforge (iftop and other utilities) and reinstalled it from epel. There was some socat left (I don’t know what it is and where it comes from). But with atomic it is more difficult:

# yum list installed | grep atomic
atomic-release.noarch              1.0-19.el6.art                      installed
atop.x86_64                        2.0.2-3.el6.art                     @atomic
libmcrypt.x86_64                   2.5.7-5.el6.art                     @atomic
memcached.x86_64                   1.4.13-1.el6.art                    @atomic
mysql.x86_64                       5.5.47-32.el6.art                   @atomic
mysql-libs.x86_64                  5.5.47-32.el6.art                   @atomic
mysql-server.x86_64                5.5.47-32.el6.art                   @atomic
mysqlclient16.x86_64               5.1.59-2.el6.art                    @atomic
nmap-ncat.x86_64                   2:6.25-5.el6.art                    @atomic
php.x86_64                         5.4.44-50.el6.art                   @atomic
php-cli.x86_64                     5.4.44-50.el6.art                   @atomic
php-common.x86_64                  5.4.44-50.el6.art                   @atomic
php-devel.x86_64                   5.4.44-50.el6.art                   @atomic
php-fpm.x86_64                     5.4.44-50.el6.art                   @atomic
php-gd.x86_64                      5.4.44-50.el6.art                   @atomic
php-mbstring.x86_64                5.4.44-50.el6.art                   @atomic
php-mcrypt.x86_64                  5.4.44-50.el6.art                   @atomic
php-mysql.x86_64                   5.4.44-50.el6.art                   @atomic
php-pdo.x86_64                     5.4.44-50.el6.art                   @atomic
php-pecl-apc.x86_64                3.1.15-0.6.svn329913.el6.art        @atomic
php-pecl-memcache.x86_64           3.0.8-3.el6.art                     @atomic
php-soap.x86_64                    5.4.44-50.el6.art                   @atomic
php-xml.x86_64                     5.4.44-50.el6.art                   @atomic

In a good way, before deleting atomic, you need to delete all this, and then reinstall it from IUS? Or can you just delete the atomic repository, add a new one, and then somehow update everything through it?