Roadster Door Knob

[chrs1961815]

So I just took these two door knobs off of my AR28 Roadster and they are different from others I have. The one that was on my car is on the left and it has an octagonal shape. The one on the right is the other one I have that has a hexagonal shape. There is also some differences on the top and the base. So my question is, are the ones that were on my car a thing of early 28's? I couldn't find anything about it in the judging standards or anywhere.