A key difference is that MachineArt's MS and fender extender look like they are oem material. I can't say that the one displayed is a particularly good look, though we all agree that MachineArts prices are eye-watering.
My Chinese front mudguard extender looks exactly the same as the Machine Art one I had on my previous bike. I suspect it came out of the back door of the same factory, which isn't unusual with Chinese suppliers.