If the skateboarder's feet are set for going one way, and he or she ends up riding the other way, that is called "Fakie". It's different, in that the back foot is usualy on the tail, and when riding Fakie it will often be on the nose.
When snowboarders rides in the opposite stance, they don't usualy change thier bindings. They keep them set up for whatever stance they usualy use. So, when a snowboarder rides backwards it's called "Switch", even though thier foot placing may be still setup for going the opposite way. Snowboarders don't usualy use the term "Fakie".
Any tricks performed switch are harder, because the skater, snowboarder, or whatever boarder is riding opposite to his or her natural stance.

