The placement of the planks in the signs' textures is different on some types. See the attached pictures.

New Default:

1. Oak, spruce, birch and dark oak signs are consistent with each other;
2. Acacia and jungle signs have a different pattern;
3. Crimson and warped signs also have a different pattern.

Programmer Art:

1. Spruce, dark oak, jungle and acacia signs are consistent with each other;
2. Both oak and birch have unique designs, which are different from each other;
3. Crimson and warped signs have yet another different pattern, but are consistent with each other.