So, for several reasons, I won’t simply upscaling the textures from the other mod and using them.
When it comes to maintenance, I want to be independent of another source that might change.
The textures from the other mod have artifacts and jagged edges that would make upscaling very difficult—and you can’t create clean upscales from messy sources.
If you’re mainly interested in the color of the railings, I can try to see if I can come up with something similar.