Hi Alfalfa.
The bikes would definitely appear to be out of the same batch. Really strange to note however that mine ended up in South Africa! (sorry I joined the forum and haven't been to go introduce myself yet, so I am sure somebody will be chomping soon about the bad manners) I really am starting to think that they were built up from the scraps bin though and were probably destined for the non mainline market, ie indonesia india bangledesh etc.
Does yours have an official engine number stamped onto it anywhere? Mine doesn't appear to have one. Also the internet seems to have very little info on these bikes.