apache 2.4 – How to fix AH02565: Certificate and private key do not match

We have an application hosted on Ubuntu apache server and letsencrypt SSL is installed there. Now i want to change Letsencrypt ssl certificate by Digicert certificate. I followed the Digicert ssl installation document and when i try to start my apache server its gonna failed. After check error log i found below error.

AH02565: Certificate and private key urbaninspirations.biz:443:0 from /etc/cert/domain_name.crt and /etc/cert/domain_name.key do not match
AH00016: Configuration Failed

Below is my “000-default-le-ssl.conf” page script

<VirtualHost *:443>
ServerName domain_name.biz
ServerAlias www.domain_name.biz
SSLEngine On
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html

### This is using in Letsencrypt SSL certificates
Include /etc/letsencrypt/options-ssl-apache.conf
SSLCertificateFile /etc/letsencrypt/live/domain_name.biz/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/domain_name.biz/privkey.pem

### Change this for DigiCert SSL certification but getting error when enable below line
#SSLCertificateFile /etc/cert/domain_name.crt
#SSLCertificateKeyFile /etc/cert/domain_name.key
#SSLCertificateChainFile /etc/cert/DigiCertCA.crt

Can anybody point me in the right direction for what i’m doing wrong?