HWIC-2FE vs HWIC-EWS

Hi Friends, I want to have router with 2 WAN Ethernet Interface for my MPLS connectivity.HWIC-2FE seems to be very expensive when one of my friend suggested that we can use HWIC-EWS instead of expensive HWIC-2FE.Can you please answer my below queries.
What are the difference between these moduleincludinding advantage/disadvanage
any difference in configuring them as WAN ethernet port
thanks in advance