Same problem here. SCCM imports a driver Intel(R) Ethernet Connection I217-LM however on the 7450 the network adapter is a Intel(R) Ethernet Connection I218-LM. Version for the I217-LM is 188.8.131.52 where the driver version for the I218-LM is 184.108.40.206something.
Still looking for a way to import a I218-LM driver. I downloaded the stand alone NIC drivers here but they are still listed a I217-LM.