Sounds like a gray market unit, but that's only a guess.
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Could be an international version opposed to a US version. Or is could just be a newer or older one. I've seen this a lot with other gear.
Just to name a couple.... Earlier Rotel 940 CD players have no Coax digital output; later ones do. Some Cambridge Audio gear switched from a fixed power cord to an IEC part-way through the production life. Cambridge has changed remote controls in the past to the same gear. The MSB P1000 Power based went from internal jumpers to change the voltage from 110 to 220, to a switch on the back of the chasis. All of these changes happened without any change in the model number, etc.