The Change Cut is simply to change off before your opponent with your cuts, from one side to another, from above to below, and vice versa, in order to confuse him.
I’m tempted to interpret this as beginning the cut along one line and then changing to a different line midway through the action. This can be done with any sword, but is particularly effective with the longsword because of the extra mobility offered by the two-handed grip. However, I believe that is actually called Fehien or Failing.
So for the time being I’m sticking to what I wrote in Talhoffer 1467 Plate 2 Right. Specifically, this is just a cut used to change lines or guard rather than to attack with.