Hello Yes, those DIMMs are interchangeable. We sell them under the same part number. They can be mixed without issue. The two Dell part numbers for those DIMMs are F1G9D and 7N0WM. Thanks
Hello, We have a PowerEdge M520 with one E5-2470v2 and four memory module 32 GB (P/N: M386B4G70DM0-YK03). Now we are buying an additional processor kit so we would buy four 32 GB modules for the additional processor. Our Dell reseller has 32 GB modules P/N: M386B4G70DM0-YK04. It differs for the last digit, the specifications are the same. Someone could help us to understand if that memory is compatible with our system or if we have to buy exactly the P/N: M386B4G70DM0-YK03? Thanks in Advance,Davide 
Memory for Blade PowerEdge M520