If you are referring to the 1751 DB from PEQ's SVN for DB updates, then you shouldn't have to source in anything else to run the Source Code from Rev 1751. If you are referring to simply updating your source code from 1667 to 1751 and not updating your DB to match, then yes, you need to run at least all of the required SQL between those 2 as seen here:
http://code.google.com/p/projecteqem.../utils/sql/svn