My point in changing the white background to green, was to allow for white lines. If you don't/can't go with lines, it doesn't matter.
Our (private) course has 2 overlapping layouts, which are much more confusing than these. We created course maps that only show one layout each, and tell people that if they see something that's no on the map, it's the other layout. With signs showing hole numbers & layout, and baskets showing hole numbers, it seems to work pretty well.
I'm not sure if that will work any better for you, or not.
Yeah, I understood you to be saying that each line would be colored to show which layout it corresponded to. Coloring the background to allow for white lines makes sense. I thought circles might also make it clear, without the potential clutter that can come with lines. Trying both ideas out is cheap, just a little bit of my time. Sort of a "measure 50 times, cut once" approach.
We are trialing these signs as simply printed, laminated paper first. So really we can do whatever we want. I'm not aware of anyone opposed to showing lines, but we can cross that bridge if we come to it.