safely removing duplicate domain controller certificates

I have a situation where I have incorrectly added a 2nd Domain Controller certificate ( for server, and client authentication purposes), and i think this is causing me problems with LDAPS authentication ( from some external java applications - using LDP locally works fine, and can bind to SSL on port 636)

See attached picture.

The Certificate with the expiry date 04/02/2021 is the one is have just created ( and would like to keep )
The Certificate with the expiry date 05/06/2020 is the certificate that was originally installed.

The only other relevant information is that this domain controller was migrated from SBS2008, and the CA root certificate was migrated over.

So - is it safe simply to delete the expiry date 05/06/2020 certificate in Certificates MMC, or is there anything else i need to do / not do !
Thanks