New Certificate Authority for code signing certificate

I have a code signing certificate and I’m in the process of having to change from one CA to another. The current cert is used to sign a ClickOnce application (targets .NET framerwork 4.5). I’ve been advised to create a brand new cert, but I have a concern that a new cert with a new key will causes issues with clients receiving updates to application.

Can anyone tell me if this will infact cause an issue? And if so, is it possible to submit a CSR to the new CA but with the old key from the old CA?

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