EA6400: Port forward two Netgear ReadyNAS FTP servers

I have a new EA6400 router with the latest May 2014 firmware. I also have two Netgear ReadyNAS network attached storage devices that are set up as FTP servers. With my old Netgear WNDR3700 with DD-WRT firmware (after the last thunderstorm, may she rest in peace), I could easily set up both with port forwarding and access them outside of my LAN by setting up 4321 and 4311 as ports that translate to 21 and 21 to two different addresses on my network. I have them set up the same way in the EA6400, going into Single Port Forwarding and forwarding 4321 to 21 at 192.168.1.144 and 4311 to 21 at 192.168.1.143, but the EA6400 tells me that I can't use the same port (21). Why not? They're going to different addresses. (Oh I wish I could get DD-WRT on this router!) Is there a way to set up two FTPs on a local network and make them accessible through the EA6400 to an address on the internet?
I have also attempted to disable one of the port forwards and attempted to access the remaining FTP server and have had no success. I have successfully forwarded a port on the EA6400 to my security camera system so I can monitor my home from the internet, so I know the basics of how this is done. I just can't get single port forwarding to work with my NAS FTP servers.
Any ideas?

I switched the settings around and now the other ReadyNAS is coming up, but the one that used to come up no longer does. I also tried replacing the 10001 with 2121 on both EA6400 and on that particular ReadyNAS because it seemed to be a little more common a number for an alternate FTP port.
So now I have access to the one I couldn't access before and the one I could access before I can no longer access. Of course I can switch them back around again, but I'd like both to work.
Of course one could potentially put the blame on the ReadyNAS as possibly not being able to work FTP off any other protocol than 21 but I have to place blame on the EA6400 router firmware. This worked well under DD-WRT.
Anyone have any more ideas? I appreciate the help.

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