I am going to add on to what 762s said.
The soles on Imperial Boots are different from the origional boot soles. The slots and spaces are different (like 762s stated), and can't really be modified easily to make them look like the screen used boots, like needed for Lancer.
Rs:
And origional:
Also the bone stitching and bone position look a little off, but that's not as important as the soles.