[CentOS] CentOS 6.3 packages updates options without upgrading.

Hi,
Thanks for your responses.
Unfortunately, there's not possibility in this specific situation to be
able to update from 6.3 -> 6.8.  But, it would be nice to be able to update
specific packages to latest that's available in 6.8 repo at

 http://mirror.centos.org/centos/6/os/x86_64/Packages/


For example,

nss-util-3.21.0-2.el6.i686.rpm
<http://mirror.centos.org/centos/6/os/x86_64/Packages/nss-util-3.21.0-2.el6.i686.rpm>

2016-05-12 10:48

67K



nss-util-3.21.0-2.el6.x86_64.rpm
<http://mirror.centos.org/centos/6/os/x86_64/Packages/nss-util-3.21.0-2.el6.x86_64.rpm>

2016-05-12 10:47

67K



nss-util-devel-3.21.0-2.el6.i686.rpm
<http://mirror.centos.org/centos/6/os/x86_64/Packages/nss-util-devel-3.21.0-2.el6.i686.rpm>

2016-05-12 10:48

69K



nss-util-devel-3.21.0-2.el6.x86_64.rpm
<http://mirror.centos.org/centos/6/os/x86_64/Packages/nss-util-devel-3.21.0-2.el6.x86_64.rpm>

2016-05-12 10:48

69K



Simply updating these packages on 6.3, would there be any issues w/o
updating rest of the packages from 6.3 to 6.8? As I mentioned, 'yum update'
or updating to latest 6.8 packages from 6.3 is not currently plausible or
even feasible for some reason.  Or, please suggest any other options to be
able to update such packages w/o updating rest of the userland on 6.3?

Thank again very much.