Actually the answer is yes and no. If you are replacing the whole axle from the diff out they are differant. However if you are just replacing the outer section (using the existing inner cup) they are exactly the same.
Something ro consider though...the aftermarket shafts/cv's are far weaker than the oem shafts (with exception of the rcv shafts when they become available). This is fine for normal road use but if you wheel a lot you might want to become familiar with field repair/replacement.