Please do not just replace images. Either replace them everywhere and mark old images for deletion, or not replace them at all and just add new images instead of replacing old. It's VERY hard to clean everything after such replaces.
Sorry about that, is that I really want to remove the old images of the site, and I can not, the reason for me to duplicate the images is because there are images with old names, a example:. j382h.jpg mixed numbers or letters, and I think that you can not rename them? or is it?