Mercedes offers the E class in three different trim levels in Europe - Classic, Elegance, and Avantgarde. The three differ in the standard options content, and also the exterior trim and design. Avantgarde always uses a different front fascia and grill. Regular U.S. models use the elegance trim level, but have higher standard equipment levels than do European Elegance models.
I ran across this while looking for a plate mount for my AMG. The same part number is used to mount a U.S. style plate for either the AMG or Avantgarde bumper. Doesn't make it any less expensive, unfortunately.