X5 key / driver setting question

[N S]

I thought I read, or was told, that the driver settings (seat/mirrors/stearing wheel position) are, or can be, key specific....so for example when opening/unlocking/starting the vehicle with key #1 all the forementioned items will default to the memory position #1. Likewise, when using key #2, the items default to the memory position #2. Is this true? If so, what initiates the setting change -i.e. using the key FOB to unlock the car, using the key itself to unlock the car, or using the key to start the car?

Thanks!