1) The BMW Milano Beige is darker and more gold orange/brownish I would say.
2) Simply because it wouldnīt go very well togheter. The colors would probably clash.
By the way have you looked at Cashmere silver metallic. This color have just been made available from June production, which is probably the reason no one have mentioned it. Itīs a much more subtle color than Milano Beige.
Cashmere silver is also the launch color for the 5-series touring. Some early launch/press photos of the touring have previously been mislabeled as Milano Beige on some sites including this one.
http://www.worldcarfans.com/21006162...-touring-f11#0