No problem. I was feeling the same when I started moding my phone ;)
To answer your question there is only one difference. The Chinese language (the developer is chinese if I am not wrong) is preset compared when I moded my K20 Pro.
I found a bug compered to Chinese ROM. On Dark mode the setting "Adjust contrast automatically" and "Adjust wallpaper to Dark mode" is always ON (changing has no effect). It can not be tuned off on K30 pro