NO! - They are two totally different applications

mosKnowledgebase was released several years ago and was the first ever Joomla Component to feature xAJAX.

Joomla Knowledgbase is a standards compliant, streamlined knowledgebase application for Joomla 1.0.13 and soon to be Joomla 1.5. It has be written and rewritten from scratch to provide the best possible admin interface and also compatible with Joomla 1.0.13 & 1.5 versions - we even have a working version in Drupal!

Customers who purchased mosKB are not automatically entitled to a free copy of Joomla Knowledgebase - they are not the same component, there is no shared code, and JKB is not an upgrade to mosKB. There is no upgrade path.