Looks similar to the Mondo with maybe some small color changes and gamma adjustments. This just gets more and more complex (or a mess). I'd take that over the MGM any day of the week, its looks more authentic to the age.
With all the interviews about the 4K restoration. Could they of been in reference to this and the green is all MGMs fault? I ask that since the pics of the Fistful 4K restoration had the same green cast as GBU but maybe that was MGM too.