I think the Murakumo 11 to 13 are more BASED from Saya than litteraly cloned.
It has always been bugging me that Noel, Lambda and Nu have distinctive traits of their own. The one who's closest to looking like Saya is Noel. And I always wondered how in the heavens Ragna figured that the emo girl in a shrine temple dress was Saya...
Tl:dr, Noel, Nu and Mu look too different to be real clones in my opinion. BB may even look at clones in a different way than our medias usually do (perfect replicas).
But considering how inconsistent BB's artworks are, it wouldn't surprise me that those girl are "officially" perfect clones of Saya...