Modern mod managers (like Vortex or Mod Organizer 2) understand how to handle BSA files. However, conflicts can arise if two mods try to replace the same voice line (e.g., two different overhauls for the same follower). The winning mod’s BSA or loose file will take priority.
To avoid ever having to panicked-search for “Skyrim - Voices-en0.bsa fix” again, follow these best practices: Skyrim - Voices-en0.bsa