5820 HD backplane

I just got a 5820 and I was looking at the hard drive caddy and there is three slots for standard 3.5 Hard drives and a single nvme Slot. On the backplane it’s a green Circuit board and says u.2 Imprinted on the board. Can I Install regular sata drives or do I need to change out that backplane to the Same one as the other two hard drive slots? The other two slots is just a metal bracket with the plug connectors pushed through it so it’s different than the other two slots