I got xLights to successfully control my LOR controllers over the two networks.
One network is Universe 1, the other Universe 2. I had to modify the LOR IDs so that they are 01 thru 0C (channels 1 thru 192 on Universe 1), as well as LOR IDs 01 thru 0B on Universe 2 (channels 1 thru 310).
Somehow xLights is intelligent enough to know channels 1 thru 310 on Universe 2 is actually channels 511 thru 820.