Yes, Lordsandy has found an ASI 4x20 scope that does look like the ROTJ scope and there is a definate possibility that it is. However, as was stated above, these scopes were made by several manufacturers throughout the years and I find it hard to say that the ASI is the only scope it could be.
Basically, the differences in the 4X20 seem to be the screw on end bell shape, placement of the adjusting knobs, knob covers, and clamps. You just have to keep your eyes open for the right type.