We have had this discussion many times.

Some vehicles have the valves on the valve cover and they control both EGR and transmission vacuum. There must be two different valves for this to occur, AFAIK.

Some vehicles have a single valve on the valve cover that controls only the EGR.

You have to trace them down to see which function the valve controls. If it's EGR, the valve can be eliminated, if it's transmission vacuum, it cannot.