And here is the ingame shot:
Getting there took quite a while. First I had to get the grass color right which is a really annoying thing to do as I can't just take the colors from the texture due to the different lighting in Terragen and the game. But I got there after about 10 iterations or so...
Then I noticed something that I already knew but had completely forgotten. The TSL Dantooine skybox is rotated compared to the K1 skybox, so my reused K1 terrain was also rotated ingame. To fix this inconsistency, I had to rotate the camera in Terragen, but then I also had to move the sun accordingly so that it stays where it's supposed to be. But then the sun disappeared behind my clouds and it's impossible to rotate the clouds in TG which was a real shame in that case because I liked those clouds a lot. Many cloud iterations later, I got new cloud shapes that look good again, so those are what you see in the screenshot.
Now I just have to fix the 3d grass in the skybox and fix the actual skybox model. Currently the horizon is still way too high.