Want to go from USB HDD to other source

If I choose to switch from USB HDD to a NAS, I’ll have to add the new sources for videos and music. However, I’m unable to remove the existing sources because, according to this thread and my own experience, because the existing sources are on a USB HDD, there is no “Remove” option for them:

Is that going to cause any problems, either with adding new sources or Kodi accessing them (Would they need to be named differently, etc.)?