The requirements for comparability of EPDs are set in Section 6.7.2 of ISO 14025. Among others, they involve belonging to the same product category and aspects of the LCA method that need to be identical or equivalent.
Achieving these requirements is most easily met by two EPD registered based on the same Product Category Rules developed based on the general LCA methodology in the same EPD programme. Other EPDs may also fulfil these requirements, but this puts additional requirements on the reader of the EPD to understand if the information is comparable or not. For construction products, Section 5.3 of EN 15804 sets additional requirements for comparability, for example that the EPD shall be cover the full life cycle and be in the building context to provide a tool of comparison.
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