I was at a thrift store today and saw some DreamCast controllers. While most of them were 3rd party ones, I found this one that caught my interest. It looks almost exactly like an official controller, however the DreamCast logo is blue instead of orange, the back of the controller is transparent gray, and the controller plug is green. The 1st party controller I already have has the standard non-transparent back and white plug. I am also curious as the official controller has the HKT-7700 model number within the plastic on the back, yet the other one doesn't have any markings (though there is some sticker residue in the area). I also notice the circuit boards look different.
Here are the two controllers side by side. Official one is the one on the left:
So this leads to my question. Is the one on the right a controller from a different region (I'm in the US), or is it just an aftermarket controller that looks like the real deal?