Ghost copy? Im guessing youre using a second object as a second layer for your lightmap? Then yes if you move one youll have to move the other (unless you set the lightmap as a limb/child to the main object. do that in your 3d modeling program). If it doesnt look like they are lining up after you move them, check and make sure their base position is the same (ther position offset from the modeling program you used to make them). Just do a little trial and error (move the ghosted object to the other objects position +- a couple units) untill you can till which drection the offset is.
All you need is zeal