Usually Not.  Once we’ve digitized your logo, then we can use that same file in the future.  We can easily swap out different colors of thread without having to modify the file.  However, if you need to create a much larger version for some reason, then a new digitized file may be required.  The stitches you would use on left-chest of a polo shirt would be much different than those sewed out at three times the size on the back of a jacket.