I have one and don't believe it is. I've been meaning to contact Area 419 about it, but mine appeared to constantly drift so I just went back to the setup it came with. Also, the 419 cup is a lot taller and would occasionally bump the tube and drop more powder in which was a pita to deal with.
I also tried to just use the new tray and the RCBS cup to see if it'll work and not have to worry about static on the plastic RCBS one but no bueno.