Is it correct that an EPB standard can be adopted in a country with some of its content replaced by national procedures?

If a country adopts an EPB standard, it can make use of the specific degrees of freedom given in Annex A of that standard (template for national choices).
These choices are introduced to accommodate national/regional differences in climate, building tradition, policy and user behaviour. This is what is known as the National Annex or National Data Sheet.

The template of Annex A of a given EPB standard even allows to replace one or more references to other EPB standards by references to one or more national standards. The condition is that such national standard complies with the input/output connections to the other standards and EPB framework methodology. This option could be used for a step-by-step implementation of the set of EPB standards at national level.

Other changes would not be in line with the EPB standard.