Will packaging a Sims 2 lot duplicate files that are already on the computer?

i want to move my Sims into a new neighborhood, so i packaged the lot. they used to live in Pleasantview, but i am about to place the packaged lot into Riverblossom Hills (on Seasons). before i do this, will it duplicate the same files? and if so, will it slow down my computer? what i don't want is two of the same family in two different neighborhoods. this is what appears will happen when i place the packaged lot in Riverblossom. i just want a clean, SAFE, download-free way to move my sims into a new neighborhood. help :)|||If you are putting a lot with sims in it, assuming those sims know other sims, and are related to dead, or members off the lot, yes. I see many unneeded character files. The sims that the sims in the lot know will be extra character files, the relatives will be extra, too. The extra files will be there, but your sims will be unable to interact with the spam files properly, they will know them, but the extra files will be (sorta) corrupted.