New 4.2fsi long block from Audi

[Mugelloblu42]

Was hoping someone may be able to help me out in here. Was tossing around the idea of getting a new long block for the rs4 instead of rebuilding the current engine. After searching online and calling the stealership I’ve narrowed it down to two part numbers. From what the dealership tells me 079100031KX is the correct long block. But parts.audiusa tells me that the correct long block is 079100031DX. Has anyone ordered a long block before and gone through this? Seems that the only difference is the KX and DX. Parts.audiusa.com has the long block for almost 10k cheaper than the dealership so was hoping to order it there just wanted to be sure if part numbers. TIA


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[Bordom]

Don't know about part numbers, but had a friend who blew up their RS4 back in 2015 or so. New longblock from Audi was $23k CAD according to their VIN.