Thanks, yeah I ended up returning the silver chuck one and buying a black chuck one on ebay from the only seller who had one. I asked him and he claimed the silver chuck is the old model and the black chuck is the new model. Though on ebay like 80%-90% where silver chuck drills.
I also checked Sydney tools who is an AU authorised seller and would unlikely have old stock and their picture shows the silver chuck ( They are also who my work bought the 2 year old drill from which came with black chuck)
When you goolge this looks like silver one Milwaukee 2504-20 M12 and M12FPD-0 looks like black chuck but sydney tools shows the M12FPD-0 with silver chuck.
So all in all very strange.
However I am happy I returned my silver chuck one and got the black chuck one. It looks nicer, it feels nice and I could swear the motor sounds a little better when you turn off the power.