Need some help ASAP. Bought a new modulator from worldparts the other day. Came in an MB box, the new part has the MB star, it's original. Only problem, it doesn't match the old modulator.

New modulator part number: 126 270 5779
Old modulator part number: 126 270 4379

Here are some pictures:

Old modulator on the right, new one on the left. Will the new one fit? Is it an updated version? Or did I recieve the wrong part?