Can two different CSR's generate the same certificate?

Hi folks,

I'm having an issue installing a couple of certificates in IIS6 for a customers websites.

The sites already had certificates, I am renewing them. Same CA.
I generated the CSR's and sent them on to the customer.
They sent them on to Thawte to be signed.
The customer sent me on the signed certificates.
When I tried to install them in IIS I got the message “Selected certificate was already installed on another server”

I looked at the content of the old and new certs and they seem to be identical which is probably why I get the message above.
The content of the old and new CSR’s is different though.

I think the old CSR’s were signed again. Either the old ones were sent to Thawte by the customer or Thawte signed the old ones again which they may have had stored somewhere.

Is it possible for the old and new CSR to generate the same cert? I wouldn't have thought so...

Cheers.
"There are 3 types of people in this world, those who can count and those who can't"

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