Daito Ryu and Yoshinkan use jo instead of yo
ikkajo / ikkyo
nikkajo / nikyo ect...

Why is this? Is it like Kung Fu / Gung Fu just a matter of prnounciation or translation, or is there a reason for the change?

Also the person recieving the technique is pretty much always called uke. However, the person doing the technique is called Tori,Shite, or Nage. Why the change, what is the difference?