Calibration of measurement equipment to PN10 measures more particles than calibration to PN23. It is therefore logical that compliance with a limit when measured according to PN10 demonstrates compliance with the same limit according to PN23 but this text should be added for legal certainty.
Catalytic Instruments GmbH & Co.KG develops, manufactures and markets products to condition the exhaust and to allow accurate measurement of particle concentrations.
You can find more information about Catalytic Instruments at their website.