The old model looks like this
While the new model looks like
The main differences are that the new model doesn't have the shiny faceplate anymore, white knob tops and a rotary master fader instead of a slider. Also it's mentionned under the heaphone jack that it has a P&G crossfader.
If you have the old model, you cannot replace the ALPS xfader with a P&G one (different construction and size).
So if you want the P&G crossfader, you can try to go back to the shop and pray they'll exchange it.
Silence is the most fragile of things. Even the faintest breath can shatter it...