03 XI Differential part numbers

I have a 2003 325xi Automatic in need of a new front differential. Searching multiple sources seems there is not a lot of information on this. RealOEM shows the part number to be 31507500799 Found a few local yards that had listed the differential. One of which had 5 of them. So figured, just in case 1 was DOA, at least they have 4 others to exchange. Went and picked it up this morning and no where could I find the 31507500799 part number. The side of it is stamped with BMW 14288320. They checked the other 4 and none of them matched the p/n I was looking for. So question is, anyone know the difference between 14288320 & 31507500799 ?



Thanks in advance!

Hoping to get some good pictures for a DIY while swapping this out the next couple days as well.