Bluttmer,   There looks to be 6 different revisions of the T620 motherboard. The part numbers you provided are two different versions. 7HNGV - TPM / Version 4 2CD1V - NTPM / Version 3   So not only do they not match versions, one has a Trusted Platform Module (TPM), and one does not (NTPM).   If you're unsure the original board for the server is, based on motherboard having different tag, you can private message me the svc tag and I can look at what it shipped with.   Let me know if this helps.    
Hello, Does anyone know how to tell what different motherboards can come with Dell T620? My T620 came with DP/N - 07HNGV but also different service tag Dell board I got…  DP/N – 02CD1V  Thank you Bill
Dell T620 motherboard revision list