I'm gonna say "no". You can add the all the components that Std. has, and you will have a "loaded up" Light that emulates Std. If you add all of KDE, it will emulate SOHO. Still, your system will continue to identify itself as "Light", and there will be underlying differences. It will be "VL 5.9 Light Cariboo Edition"
I agree with kc1di, if you want Std, install that from scratch.