If I understoood well, you want to send packets to more than one network server. This is possible, look inside the configuration file for “node servers for poly packet server (max 4 enabled, rest is ignored)”.
However, since nodes will be configured to send to one specific application with its own keys, you cannot do a double management of the same nodes - the application able to decrypt them will be just on one server at a time. If you have two different applications with different nodes, one can be on your server, one on TTN and both served by the same gateway.
And consider also that class C is not yet implemented in TTN.
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