No, the standard lens has always been a 40mm focal length.
If you change the focal length, you have to shorten the length of the lens tube.
The beauty of the manufacturing allowed Rollei to make two cameras by simply swapping the lens, top deck and aperture dial.
The Minox 35 cameras come with a 35mm lens. Very nice lens.
I don't care for the Rollei LED models because the cameras were meant to be used at waist level when metering a scene. Putting LEDs into the viewfinder turns metering into a rather clunky experience.