The pictures prove my point, just cover the SZOD areas in the same material, it evens out the entire field, frames the playing surface and would be fine. Like others have pointed out, you can go to a lot of stadiums and the "track" around the field is often a different color for good reason. But right now you've got the different color turf in the EZOD, and it joins the SZOD which is still black asphalt.
The different colored green going up to walls of limestone on all sides would look elite.