Yeah thay're on and the stud pttern is exact but im not sure about the center bore...I havent properly measured yet but on inspection it 'looks' like the centre bore of the K11 (alloy) has a taper...and the inner side of the taper looks smaller than the K10 hub center but the outer looks bigger
See my dodgy sketch atached
I havent measured this yet though so I could just be paranoid...