Checking a *.CRT, *.CSR and *.KEY are correct.

SSL
OpenSSL

Two commands which you need to run. 

#openssl rsa -noout -text -in www.domainname.com.key

#openssl req -noout -text -in www.domainname.com.csr

#openssl x509 -noout -text -in www.domainname.com.crt
Check for modulus part in the output of both commands

If the modulus output match, then your .crt and .key files are matching.

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