" ... I note that all of your videos depicting K&L engines in TRS2019 have the locos using the built-in steam sounds instead of the ones supplied with their package."
Yes, unlike the locked-down N3V DLC, I can (and do) make changes. It's all a matter of personal taste and preferences. With that locomotive I've changed the sound, the enginespec and the cab. I've also run all the locomotive and tender textures through PaintShop Pro and lightened them slightly. I know the latter is contentious, but I like to see all the wonderful details that Steve puts into the mesh.
Phil