Does the regular OEM M3 rear spoiler for the E92 fit the E93 or not??? Some say yes and others say no. Even the guys at Tischer aren't sure.
There are some on the 3 series forum (e.g. ParamedicsX5) who have listed it ("M3 spoiler") as a mod but I haven't been able to confirm that it is OEM.
You can typically make them work, but fitment usually isn't 100% since the different shape in trunk lids. For example, the carbon fiber BMW Performance spoiler fits, however there's a slight gap under the center section when mounted. I actually used a pic from an M3 vert for our website pic of this special - check 'er out here
to see what I mean. (click 'view full image' to see a larger pic)