I did this a while ago - the original paddles fitted to mine had the silver colour & could be pushed / pulled to do up & down shifts the same on each side.
I hated them - never really knew whether to pull or push to get the gear I wanted.
I changed them over for the newer style paddles which just have pull, left side changes down / right side changes up.
Straight forward swap, no coding or dealer visit required. Just swap the paddles & they work straight away.
Get the part number for the paddles from somewhere like realoem, just paddles are needed. You don't do anything else, really simple job that took about 20 minutes to do.
If I remember correctly, the paddles were approx. £250 delivered from a BMW dealer.
Matt