Now I can't exclude the possibility that ULV Penryns and Silverthornes will be sold under a similar brand name, but thats strictly a marketing issue and has nothing to do with the technical theory you were trying to 'prove'.
Oh i see: Our understandings of the codename "Silverthorne" are fundamentally different: You (and probably others as well) understand it as physical dies, whereas i understand it as a feature-set.
Needless to say, understood as physical dies there is no dispute Penryn and Silverthorne are different.
Adopting your understanding, what i am getting at comes down to this: My understanding of the DFM of Penryn-dies includes the feature set of Silverthorne-dies. There is no way to prove this currently, as products are not out yet, so it might stand in question until then.
K.