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.
MPA-Stuttgart conducts research and testing in a variety of civil and mechanical engineering disciplines, including conformity tests, approvals, and certifications.
You can find more information about MPA-Stuttgart at their website.