Here is a comparison gallery of screenshots from Arrow Video’s new 2024 4K UHD (left) and Scream Factory’s previous 2018 Blu-ray (right) of Trick ‘r Treat. You can right-click and view image in a new tab to do a comparison. The 4K UHD screenshots do have HDR->SDR conversion and so are not color accurate.
4K vs. Blu-ray
Buy the new Arrow Video 4K UHD.
Buy the 2018 Scream Factory Blu-ray.