Per ProposalWorks - List for each (just the controllers)
1769-L33ER - $3260
1783-NATR - $1110
5069-L330ER - $5470
So, on the face of it, probably cheaper w/ the 1769 anyway you split it.
However, the 2nd Ethernet port may have other advantages, like 1 less device in the middle of comms.