So, for Section 508, you would need Appendices A, C, and D, and for Section 255, you would need Appendices B and C.
Policy Brief: Summary of the Access Board’s Final Rule Revising the ICT Standards in Section 508 of the Rehabilitation Act and the Telecommunications Guidelines in Section 255 of the Communications Act
Detailed review of the 2017 US federal regulations for information and communication technology (ICT) accessibility, with an emphasis on new or changed elements. Prepared by the Partnership on Employment & Accessible Technology (PEAT), which is funded by the U.S. Department of Labor's Office of Disability Employment Policy.
Section 508 (ICT Refresh) vs. EN 301 549
Section-by section comparison of the 2017 US federal accessibility regulations in Section 508 with the European Standard EN 301 549. Prepared by Microsoft.
Standard - EN-301-549 Accessibility requirements suitable for public procurement of ICT products and services in Europe
Functional accessibility requirements applicable to ICT products and services, together with a description of the test procedures and evaluation methodology for each accessibility requirement in a form that is suitable for use in public procurement within Europe, in support of Mandate 376. Incorporates WCAG2.