Unless otherwise explicitly requested in the Notes field on the UB request form, we will purchase Comodo certificates. The Organization field is not used to determine certificate signer.
The old Comodo certificate signing process for a single domain always produced a certificate with a Subject Alternate Name (SAN). Both www.domain.buffalo.edu and domain.buffalo.edu were included in each single domain certificate. If you requested www.domain.buffalo.edu you would get a certificate for both www.domain.buffalo.edu and domain.buffalo.edu. Likewise if you requested domain.buffalo.edu you would get a certificate for both domain.buffalo.edu and www.domain.buffalo.edu.
This is no longer the case. If you need a certificate with both names you must create a CSR with a SAN field for the second name.