does it come with a wiring diagram or a schematic?
sometimes they put wire colors on schematics or diagrams, and the colors are not what you would expect. Its not Wht Blk Rd Or Gry... its W K Z M U... and there is a little table somewhere that tells you K means orange...
logically if the control module is installed in one location then one injector could be farther away from that position, and get the longer wire
the problem with technical manuals is the person who wrote it knows how to install it without the directions, so its not obvious to him that he is leaving out important information