that isn't what i mean. i did find the normal texture files, and i don't want to change the cobble texture in general because my project uses both the new and old ones, and if i would change it directly it would probably apply it to every cobble block in my project. but when you spawn a new block, you can either choose the default minecraft texture, but there is also an option "browse", which i assume you can just browse for another .png file which is the same size as the original, with player skins that is how it works anyway.