Neither the ESPR nor its DPP annex mentions ISO 14040/14044. An ISO LCA therefore has no legal status of its own within the DPP framework. It could be accepted by a future delegated act under ESPR Article 39 ("reliable, accurate and reproducible procedures"), but no legal text guarantees this compatibility to date.
Read the source article: Which method should you use to calculate a DPP (footprint, PEF, LCA)?