Trying to combine resource packs for server resource pack, and having issues

{
            "type": "directory",
            "source": "blueprint",
            "prefix": "blueprint/"
        }

Both resource packs have a blocks.json file located in a minecraft/atlases folder. However, they each have their own respective text and I don't know how to combine them so both can be in the resource pack. One is from the Trimmable Tools datapack while the other is from the Nice Mobs datapack. Currently, if I combine them, the mobs from Nice Mobs have a missing texture icon, while the trimmable tools are just a slate of missing textures. Please let me know if you need any more info.