Copying sprite sheet/atlas and replace texture

I'm running a blur script over sprites in the editor, this works for Sprite Mode Single by the code below:

 SpriteRenderer sr = GetComponent<SpriteRenderer>();
 Texture2D blurredTexture=BlurTexture(sr.sprite.texture);
 sr.sprite = Sprite.Create(blurredTexture, new Rect(0, 0, blurredTexture.width, blurredTexture.height), sr.sprite.pivot / spriteSize);

But not for Sprite Mode Multiple(eg. spritesheet/atlas). Is there any way to copy the sliced sprites including pivots and replace only the associated texture?