I think the difference is quite subtle (one being the storage itself, the other the process to put something into it or take it away) – but does that really justify separate tags? I'd say we should merge knowledge-organization (× 14) with knowledge-base (× 10), optionally making one a synonym to the other (to prevent it from unwanted re-appearing).
Please bring up reasons why the two might be really distinct; in that case I'd withdraw my request and alter it to "creating the corresponding tag-wikis to make that difference clear" :)
knowledge-management
. Not sure about the synonyms, though.