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While the 85 dash will physically fit in the 82, the wiring is completely different from dash to dash. You would need a complete harness and ecu from an S3 to make the dash swap work. Not worth the effort in my opinion.
the earlier 79-80 dash top will fit no problem. Some of the early 79's had a speaker grill in the right side of the dash. That's the only difference that I'm aware of.
There are only two codes I'm aware of that could be validated on the vehicle itself. That being the engine size (All SA had 12A, and FB had it in the VIN). The paint code is the other and it is a plaque on the firewall. The trim level/colors for individual first gen RX-7s aren't documented except with Mazda maybe.
The only place that listed the interior color was the window sticker. If there was a code that designated the color, it was never published since you couldn't actually order any specific options from the factory. Along with Black, Wine was used with Sunbeam Silver and Aurora White 79 / 80's. There was also a reddish / purple color used on the dashes in some Sonic Bronze color cars.
Thanks. Mine is wine leather, VGC (dare I say, perfect). Again vehicle was an RV tow-behind with 60K on odometer, would be surprised if the drivetrain has even half that mileage on it.