I tried to install qt-mobility.i686 and qtwebkit.i686 from Fedora so I can install Skype.
It demanded a ton of packages and among them was pam.i686. Transaction stopped with error:
Transaction check error: file /usr/share/man/man8/faillock.8.gz from install of pam-1.1.8-9.el7.i686 conflicts with file from package pam-1.1.8-9.el7.x86_64 file /usr/share/man/man8/pam_env.8.gz from install of pam-1.1.8-9.el7.i686 conflicts with file from package pam-1.1.8-9.el7.x86_64 file /usr/share/man/man8/pam_faillock.8.gz from install of pam-1.1.8-9.el7.i686 conflicts with file from package pam-1.1.8-9.el7.x86_64 file /usr/share/man/man8/pam_unix.8.gz from install of pam-1.1.8-9.el7.i686 conflicts with file from package pam-1.1.8-9.el7.x86_64 file /usr/share/man/man8/pwhistory_helper.8.gz from install of pam-1.1.8-9.el7.i686 conflicts with file from package pam-1.1.8-9.el7.x86_64