Thanks for noticing that - I looked at them more closely today under a magnifying glass and BOTH shafts I believe are ivory. They both have those "lines" in them. I am no expert but I think they are both ivory - one is slightly less white and has more lines in it.
I was wondering why one of the JP's had a little white dot in the center of it. My first thought was that it was the shaft the previous owner liked to shoot with better - but now it makes sense that its the one with the ivory ferrule on it. I think the dot in the JP is ivory too. Cannot be 100% sure though. Its very small.