MTC rely on MIDI command F1 which is not channel related, and so sent to the "Sys/Clk" output stream from the MIDI->CopperLan bridge, and received from a CopperLan->MIDI "Sys" input stream.
So yes, you can send MTC through CopperLan between 2 computers by creating a full virtual MIDI cable or just connect the "Sys/Clk" from computer A (V)MIDI port to a "Sys" input on computer B (V)MIDI port.
Thanks it worked! I managed to send MTC between the two DAW in very few steps. For now I am using two Macs, but in the future I want to buy a PC, and I am pretty sure this will work between PC & Mac as well.