block of charcoal datapack issue

so i made a datapack to make 9 charcoal into a coal block named Block of Charcoal, but i cant figure out how to make that item back into 9 Charcoal without it making every regular coal block also  turn them back into charcoal instead of coal.
i tried setting some tags but never worked
{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "ccc",
    "ccc",
    "ccc"
  ],
  "key": {
    "c": { "item": "minecraft:charcoal" }
  },
  "result": {
    "id": "minecraft:coal_block",
    "count": 1,
    "components": {
      "minecraft:custom_name": "{\"text\":\"Block of Charcoal\",\"italic\":false}"
    }
  }
}

{
  "type": "minecraft:crafting_shapeless",
  "ingredients": [
    {
      "item": "minecraft:coal_block"
    }
  ],
  "result": {
    "id": "minecraft:charcoal",
    "count": 9
  }
}