puppet and mcollective plugins, broken on CentOS 6

[Fabrice Bacchella]

I want to both install puppet 4 and some mcollective plugins on a CentOS 6

As the the mcollective plugins are not in the PC1 repository, I need the products repository. But then :
yum install https://yum.puppetlabs.com/el/6/products/x86_64/puppetlabs-release-6-11.noarch.rpm https://yum.puppetlabs.com/el/6/PC1/x86_64/puppetlabs-release-pc1-0.9.2-1.el6.noarch.rpm
...
Transaction Check Error:
file /etc/pki/rpm-gpg/RPM-GPG-KEY-puppetlabs conflicts between attempted installs of puppetlabs-release-pc1-0.9.2-1.el6.noarch and puppetlabs-release-6-11.noarch

That's a brand new installation.
On a CentOS 7:
yum install https://yum.puppetlabs.com/el/7/PC1/x86_64/puppetlabs-release-pc1-0.9.2-1.el7.noarch.rpm https://yum.puppetlabs.com/el/7/products/x86_64/puppetlabs-release-7-11.noarch.rpm
...
Installed:
puppetlabs-release.noarch 0:7-11 puppetlabs-release-pc1.noarch 0:0.9.2-1.el7

Complete!


Is there a bug in Centos6 packaging ?