Rattle Shad hook size ?

I have some Uncle Buck's Rattle Shad 1/8oz. 2". The front hook is a #8 the rear is a #10, I replaced the rear with a #8 . Any reason the rear would be smaller ? The action seems the same, one size up shuldn't change anything should it ? Shouldn't they be the same size anyways ? I would think a bigger hook would work better than a small one. I use this lure mainly on white bass, but do get large and smallmouth too. -Thanks