No, it will not lead to the same energy performance rating in each Member State.
Regional differences in climate, building tradition and user behaviour in Europe will have an impact on the input data and consequently on the energy performance.
The standards developed to support the practical implementation of the EPBD have to be flexible enough to accommodate these differences, both in the (national) choice between different options provided in the CEN standards, and in the (national) choice of input data and boundary conditions. See also the question on the status of the EPBD related CEN standards.
Author: Dick van DIJK (TNO)