I'd punch the mess outta' the green one.
I don't think of beholder color as one color. Waterdeep and the North had a blueish beholder. Widlspace had an orangish color. Not sure what color you would consider the Beholder on the cover of one of the Spelljammer boxed set. But even with that the gas spore could be recolored if the color is the problem. For my beholder version of orange my wife complained that it looked like a sick plant and needed to be green.Beholder-colored, so usually brown.