This patch allows you to have both the Cape Mario and Raccoon Mario powerups in one hack by making a freeram flag to control it. It only applies if you have powerup #$02 (cape).
This patch DOES NOT have any DMA set up to change your graphics, especially if you do it mid level (which you can). I suggest using another patch to allow you to use different gfx.
For example, if you don't plan on allowing the change mid level, Marioexgfx is perfect for that. If you want to make both an always available powerup and be changeable mid level, I'd suggest something else like Huflungdu's seperate gfx patch.
Ignore the hex.zip included, and do not apply it to your rom.