I'm a tenacious SOB when it comes to solving mysteries.
If you look at this page from the Scooter West site, it will be obvious that they just flipped the photo for the LH lever to use for the RH lever:
https://www.scooterwest.com/item/page/17/Tjs-EQ-/NA/
The left and right hand levers can't be the same shape, as one pulls a cable and the other pushes a piston!
That explains the difference in appearance between my LX lever and the one on the Scooter West site, but not the part number difference. I'd bet dollars to donuts that the LX lever would work, but I can't confirm that.
If you can live with black, the levers from Scooterworks are certainly the cheapest route.