LineageOs compatible with European (H850) version of LG5
The difference in baseband is often quite crucial - your link isn't showing the bands these models support. This usually warrant separate codenames and builds, although they might be unified in the future.

Given that even unofficial builds for these 2 models still opted for separate codenames instead of a unified build, it's obvious that at least at this moment you shouldn't treat them as one.

You could just use the unofficial builds for now, but shifting back to official builds after that will require a wipe, due to official builds claiming "incompatible data".