An FDES is an EPD, specifically the French version of an EPD for a construction product. Every FDES complies with ISO 14025 (which defines EPDs), plus the sector standard EN 15804+A2 (specific to construction products) and its national complement NF EN 15804/CN. A product with a valid FDES therefore, by definition, has a valid EPD on the European market. The reverse is not true: a German or Italian EPD cannot automatically be used in a RE2020 calculation if it has not been submitted to INIES and verified under the French protocol.
Read the source article: EPD, FDES, PEP, LCA: what is the difference in RE2020?