Microsoft were uncomfortable with the use of the Windows flag which forced a change.
If you were using a custom image then most likely the other machine has it as installers will not remove existing files. The images are stored in the start buttons folder off the Start8 installation folder.
If you were using the default Win8 style flag then this was never an image so cannot be copied from another machine. You are able to use your own image if you were to obtain one as that's outside our control, but we will not supply it with the product.