See the block diagrams on the product pages. CCRs have independent ports. But maybe you don't need exactly that, you should describe your situation to get better advice...
Peli: RB750Gr3 has either one or two internal Gigabit links to the built in switch (that has 5 external ports). Unless you need more than 1Gbps combined up+down, a single 1Gbps internal should be enough.