Djm 900 srt vs djm s9 cross fader

Hello I noticed that the djm s9 is listed as having a magvel pro fader while the ddj sz and djm 900 srt is just magvel. Just curious if the only difference is that the s9 can be adjusted with different bumpers or is it really and overall updated crossfader. Lastly is the new ddj rz have the same crossfader as the original sz since they are both listed as having magvel faders thanks again for the help.