Ok mate simple
Look at the hoofs these are the old style that were replaced on the PJ with an all rubber hoof (better grip, longer life and no ally to break up)
I actually walked out of one of these old style hoofs and ended up on the spring end
had to go back and pick the bits up
You seem to only get a kneebar with these whereas you get a set of cuffs thrown in with the PJ's
If they are the early models the clamping bolt was a bit weak and tended to strip threads (this has been mended on the PJ's
Can't get the big picture to load but the early ones had a less substantial heel bracket that was prone to failure this has been beefed up on the PJ's
Last but not least if that is US dollars they are nearly twice the price
Hope this helps
Jason