LightBurn uses a very specialized way of streaming GCode to the target machine to maximize throughput, so if Kimbra has a different serial buffer size than normal Marlin that could be an issue, or if it has a different way of responding to GCode commands, that would be an issue as well.
I can’t find anything on the site you’ve linked to that describes the inner workings of their serial protocol, so I would have to actually dig into the code to find this. I don’t currently have a way to disable this specialized sending in LightBurn.