Batch Replace SPRITES in WAD

I have exported several sprites (enemy sprites) using XWE and now i want to import them. Do i really have to replace them one by one and modify the X/Y values by hand? Can't i batch replace the existing sprites with the modified exported ones?

http://forum.zdoom.org/viewtopic.php?f=19&t=19876

I don't understand how this can help. I need the original X/Y values of the IWAD, not a tool that allows me to calculate a new one.