Repetition (like in DRY) is duplication without reuse. When I think of duplication in the negative sense, I think of repetition, not reusing a module or library

Repetition (like in DRY) is duplication without reuse. When I think of duplication in the negative sense, I think of repetition, not reusing a module or library. Another negative thing with duplication is taking up more disk space, but a good file system will take care of that! Then there is "DLL hell", or "library hell" where two programs use the same library, but different versions ... How do you reuse without duplication ?