I used the originals on the CTX, Etrac, Soverign Gt and the Nox. I always use a the wireless module on the ctx and the nox. On the Etrac I plugged them direct into the machine. I use them for coin hunting and recovery calls.
I do like the new headphones better. They fit my big head better. The ear muffs feel nicer than the old pair I have. I think they keep the outside sound down about the same. The add says they have a 2 db more reduction than the originals.
From what I can tell, they use the same speaker element and they sound the same.
The ad for them list a bunch of upgrades they did from the originals. I personally like them and don't have any complaints.