Copy a static picture beetween 2 different sprite object

How do I…

I have sprite global object of type sprite (ok 3D sprite, but I could downgrade to 2D sprite or else if necessary).

All instance of global object of object group A (group of 3D sprite) display a static picture.

On a specific condition, I want the object B (another 3D sprite) to copy the static picture on the selected A object, and use it also as static picture for self.

Is this simply possible? Or do it is necessary the object B to know all the possible animation of all objects of A group?

I see there is the possibility to load a file through path, but then can I get the path of the picture of the instance of A?

Thanks in advance for your help.