osCommerce MS1 upgrade

Hi An MS1 based store is to be upgraded to MS2. TASK OUTLINE: 1. Very minor changes have been made to the DB. You need to compare the MS1 DB to the MS2 DB and create a solution to move all data. 2. The old site also utilises a lot of content outside of osCommerce. This is to be moved to the new osCommerce store, utilising the "extra pages" contribution or something similar to allow cms. Have you any experience in upgrading an osCommerce store? Particularly MS1 to MS2. Thank you