@jimp:
Easily solved by assigning each instance as its own interface and then applying NAT rules on the interface specific to the connection you want it to work upon.
Jim, thanks for the tip. It's obvious how to do this in the plain-text files, but not so obvious (to me) how to do it in the PFsense GUI.
What I see now is that you must assign an "Interface" via Interfaces->Assign to each OpenVPN client interface (ovpnc1, ovpnc2) and then assign an Outbound NAT to each one.
Perhaps a Wiki topic for future users?
Thanks again!

