AD7966 external reference input

The AD7966 has a reference input spec of up to (Vdd-0.2) volts: nominally 4.8V.  However in the "External Reference and Internal Buffer" section, it describes the buffer as being limited to 4.096V.  Can the reference buffer be successfully used with, for example, a 4.5V reference (e.g. ADR431)?

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