Thanks for the replies!
Ashley, I'm not sure the manual entry you pointed me to actually answers my question, or perhaps I just misunderstood.
I'm trying to work out if moving a sprite (containing 20 images) across the screen will use up more memory than moving a sprite with just one.
Perhaps it'd help to provide a use case scenario: I have a a collection of sprites and each contains an animation of around 10 images. This animation only needs to play when the sprite is touched.
As each sprite move around the screen, their movement appears to be rather clunky. So I wondered if it would provide smoother performance, if I used a sprite with a single image, to move around the screen. Then destroy the single image sprite and replace it with another sprite that contains the animation, when needed.
Thanks again for your help.