Hi John,
If you look real close at the bottoms of them you'll see that they are different. The one on the left is the newer one, it has the swaged on handle retainer, while the older one on the right has the screw on handle nut. Hard to see unless you enlarge the picture.
I wish I could tell you that they had been together for long time but that is not the case. I got one back in March of last year and the other off ebay a month or so ago.
I didn't post a picture, but there are also two different all metal ones that are about 5 in. long. One has a round handle with some knurling at the end of the handle, and the other, much more common one, has a kind of oval shaped smooth handle similar to the larger all metal versions, although the larger ones have a pattern on the handle.
My quest is to find one with the round handle and the knurling, I have never seen one, only a picture in Herb Page's Coes Wrench book.
Mike