I can't believe I missed this thread the first time round.
Here's a nice, short video that helps explain the difference. They're very similar but produced using different methods (creaming vs wet-dry).
My cupcakes are exactly the same recipe as my cakes - the only difference is whether I use the cake pan or the cupcake molds. https://www.youtube.com/watch?v=wMfUPNnVcw4