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The anwser is as same as Bipin's, YES, it possible to upgrade from K to L.
I would like to mention is since Icehouse, the OpenStack upgrade almost follows the same way so you can try this:
http://docs.openstack.org/openstack-ops/content/upgrade-icehouse-juno.html

In my experience of upgrading from J to K, (just for testing, not provided to my customer finally), there are many trubles such as DB sync...
Besides, you must plan carefully about backup and rollback in case of the upgrading is failed.