What is currently inside the data.zip IS NOT what is in the CoreXML files, at this moment. They've got some REALLY BAD CODE in some of the core XML file (Kingdom Unique and Kingdom Special buildings) that will essentially BREAK a majority of the Kingdom buildings if you rebuild that data.zip file. It doesn't appear that Stardock is even aware of this despite me reporting it in Support and talking to a dev about it.
Don't rebuild that data.zip file right now.
Once the patch is release, I hope they are using the same files. Otherwise, there is no point to having the XML files at all (except for some reference).