The texture for Tuff Bricks introduced in snapshot 23w43a does not match the other stone brick textures - it has two half bricks on top and a whole brick on the bottom, instead of the other way around.
This resource pack fixes that, and makes the tuff bricks match the design of stone, deepslate, and blackstone bricks, so they'll look better in builds together. Nothing else about the texture is changed, the bricks are just moved around.
The texture was fixed in 23w44a so this resource pack is not relevant for anything besides one snapshot version :/