They should be the same, it's not uncommon for Dell to have multiple part numbers for the exact same component.
Hi guys, I am needing to buy 2 5108 Ethernet switches for some MX7000 chassis and I'm not sure which part number I need.  Can you please tell me if its part number 95M9H or 74XDW?  or both work?  Thank  you!  
MX5108n Ethernet Switches for MX7000 Chassis