Do all animations of a Sprite affect the Fillrate if one instance playing 1 animation is in Layout?

Let's say I have GuiBackground Sprite Object with 50 different animations in it.

If I place the GuiBackground in a Layout and set animation to Animation1, do the 49 animations also keep getting loaded into the GPU's memory or just Animation1?

Testing this, to me it seems that all the animations get loaded if only one instance with 1 animation is in layout, but I am not certain.