We do speak of sameness in application to phenomena; we say this is the same colour as that; this is the same musical note as that; this is the same sensation as that. But here we mean a different thing by the word same. We mean indistinguishability. We mean that we cannot distinguish between the two colours, the two notes, the two sensations.
The differences between reformed left and new right in both parts of the continent have blurred to the point of indistinguishability. French socialists have privatized more than their conservative predecessors. The Tories still complain bitterly that Tony Blair, with his nondescript "Third Way", has stolen their thunder.