Thanks for the pictures. The only real difference is the thickness on the radiator. The one with the thickness of
28mm is intended for use with an engine oil cooler, the one with the thickness of 34mm is intended for use with a transmission oil cooler. Your original part had a thickness of 34mm and you have a transmission oil cooler, so you needed to order part #438034. The part that you did order is 28mm and is for an engine oil cooler, which is the wrong part for your car.