This is the closest I can get.
Guest NTSC shader seem to not been fully updated to your most recent version for RetroArch.
Any chance to update it with Rainbow parameters like your wonderful current version @guest.r
Great work still. At least the dithering still can be present for modern-retro-based games ! Please dont let the rainbow been forgotten in the name of nostalgia !
First one is Guest advanced + NTSC shaders. Second one is just Advanced