It's a possibility, the XLR and TRS may be parallel wired. If that's the case you wouldn't need to do any switching. If you have a schematic for the amp it would show it, but you could just try it as a pass through. If it works you're good to go. You wouldn't even need a second amp to test it, just connect the TRS of the two channels with a cable and see if the signal passes to the second channel. If it doesn't work that means the XLR and TRS each have their own input buffer.
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