Yes Ktm did do a MX and Gs .
Gs  had lights , 5 speed gear box ,a hoop of the rear mud grad , speedo and a Choke on the handle bars.
Mx  4 speed , no choke , floating rear brake , smaller tank .
Most of the ktm that come into Oz where Gs, whith Mx parts 
Not many 495 came Less than 30 in 1981