Go for it. I was the opposite of you, I had the boat raley but just learned it on the cable. Its pretty much the same only you dont have to load the line as much. Just edge hard through the wake and from there its the same. Good luck.
I've had two friends go out with me on the boat that weren't boat riders. Both had the raleys on the cable and both were doing them behind the boat on the first day out. So I'd say that the skills transfer pretty darn well.