mpss-modules-4.18.0-348.2.1.el8_5 contains the MPSS 3.8.6 kernel modules for the Xeon Phi x100 (KNC) co-processor built against the RHEL 8.5 kernel sources.
mpss-daemon-3.8.6-4.el8 contains the patched mpssd daemon for the Xeon Phi x100 (KNC) co-processor.