The BladeForums.com 2024 Traditional Knife is available! Price is $250 ea (shipped within CONUS).
Order here: https://www.bladeforums.com/help/2024-traditional/
My guess is that the top one is the oldest because it looks like the slimmest, with maybe a more refined knob.
I would suggest saving it and finding a suitable head for it.
I got another old handle with these that I thought might be a Plumb because it had a hole in the top that looked like a screw-wedge would fit in, but unfortunately it is badly warped so probably good only for kindling.
I do not even see how to work the PM system here, I apologize to those who I asked to use it. My email is xxxxxxxxxxxxxxxxxxxxxxxxxxxxx.com. I do not have a cell phone so the only time I check this stuff is when I can sit down at a desk computer.
It has to do with the grade of the hickory in the handle.
Seymour Midwest owns O.P. Link, and still sells their handles under that branding.