PRC is classic coin i made 2014, i'm trying to modernize it and revived it, so yes it will have modern code.
PRS is some new concept however it need a lot of work to be done and i don't have much time, in order to get help i start train local developer, that why KHC come in.

KHC is a project demonstration to teach local developer to start doing something with cryptocurrency development, currently we train few developer to compile and understand the process, take a lot of time but when they are ready all other project will be easy.