According to UCCE reference design CVP is a core component of UCCE, CVP is responsible for the IVR flows of UCCE. On UCCX the ivr flows comes built-in on the product. So while UCCX comes with most features built-in on the same server/vm and are address as services, UCCE has a distributed design where the features are handled by different vms/server.
You can check the difrerences on the Design gudes for both UCCE and UCCX
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