Those four all match the documented Genre2 and data fields.

The VCR4 command you emailed matches the Zone 2 sample you pasted above.

These extra samples are enough to confirm (in my opinion) the theory that Denon is using Panasonic's version of the parity computation.

Why does Denon document a different subset of commands for each zone? The command bits and zone bits seem to be independent (where a command is documented for two different zones it has the same data part). So every command can be encoded in every zone.

I don't really know what a "zone" is. Are some commands not physically meaningful in some zones? Or the device doesn't impliment them? Or they just skipped them in documentation?