I'm not exactly sure about the number of wires or that what I'm writing here is 100% correct but it is close. The early 050 wiring harness (the one after the 040 harness and not the later Honda 050 harness with the bar code parts label) has a few additional wires spliced into the loom. Several are for the pilot bulb (park bulb) which was a design requirement in at least some European countries such as Germany. Therefore the later 050 harness became the standard for all production. Countries that didn't require the pilot light etc just didn't use the additional wires in production.
The fact is, a 050 harness can be used without problem but given the anal nature of us all the simple fix is to unravel the 050 harness and remove the additional wires which are solder spliced into the loom, re-wrap the 050 harness replacing the 050 tag with you old 040 tag. Trouble is the 040 tag is usually war weary and in need of replacement. This is where Wayne's project will be invaluable to those who are wanting to go this route with a nice new shiny label.
As for the Yamiya harness, this is a reproduction and NOT a Honda harness I have one and what is seen in the pictures (follow the link Wayne has provided) is nothing like a Honda harness Even the later Honda harness has the black tubing which is absent from the Yamiya and other reproduction harnesses.
I'm sure others can add to these words as I haven't unpacked my spare harnesses to do the comparison but I did do it some years ago and this brief outline is what I recalled. As for the label without the 4, I don't have a clue
KP