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At renewal is it necessary to re-key the new cert by generating a CSR?

My Exchange 2010 SAN cert expires in couple of weeks so I renewed it (made the payment). Now a cert is ready to download and install. Will this automatically createding cert work if i download and install it or do I need to generate a CSR and re-key the cert and then download and install?  There is no change in domain or server name, etc. Thank you.