How to verify that a certificate and a private key in pem format match?

Solution In Progress - Updated -

Issue

Undercloud install fails in post-configure phase.

grep haproxy
(...)
un 27 15:57:30 <hostname> haproxy-systemd-wrapper: [ALERT] 178/155730 (29371) : parsing [/etc/haproxy/haproxy.cfg:23] : 'bind <ip>:13777' : inconsistencies between private key and certificate loaded from PEM file '/etc/pki/instack-certs/undercloud.pem'.
(...)

How to verify that a certificate and a private key in pem format match?

Environment

Red Hat Enterprise Linux OpenStack Platform 7.0
Red Hat OpenStack Platform 8.0

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