SSL Certificate Public Key has changed after renewal

Recently ssl certificate has been renewed automatically for our domain, after renewal the Public key has also changed. Is there a way to preserve the public key on renewal of certificate? I am a free user. Implementing SSL pinning using public key and reduce the interval of releases by pinning public key, which is one of the way achieving SSL pinning.

Is this HPKP?

Yes it is public key pinning but on android and iOS devices. This is identified as security vulnerablity in External Application Penetration Test.

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