Project's KB weight not influenced by use of prefabs?

Hello,

my question is: if, for example, I publish a project whose scene contains 1000 copies of the same non-prefab object, the build weight will be the same than if the scene contains instead 1000 instantiations of the same prefab (not instantiated at runtime, obviously)?

I actually tested this, and it seems that there's no difference, while I would've thought that using multiple times the same prefab should've reduced the total KB weight. I'd like to have some confirmation, or to know if there are cases in which prefabs might actually reduce a project's weight.

Thanks,

Daniele