All sql scripts are located under
/Setup/applications/[appname]/SchemaInstallScripts/mssql/
and
/Setup/applications/[appname]/SchemaUpgradeScripts/mssql/
If working with the source code, these get copied on post build for the blog from mojoPortal.Features.UI/Setup/blog/...
mojoPortal version only corresponds to the version of mojoPortal core, blog version is independent of that.
If you clone the blog you should make procs with your own prefix.
To clone a feature, you need to understand the installation system.
http://www.mojoportal.com/setupandupgradeforcustomfeatures.aspx
http://www.mojoportal.com/using-the-installation-system.aspx
Hope it helps,
Joe