It is the same, just that you can use different layers when making the skin. I only used the inner layer, and you have used both inner and outer layers. So my skin fits into a different part of the same template.
oh sorry I thou-wait! I've put 3 layers on a skin using needcoolshoes.com! so whats the inner and outer layers? also I only used one layer.
If you go to Nova Skin you can search for your skin, and edit it in that site. If you look at the bottom left corner of the editor once you found your skin, there is a player model which you can click on to toggle editing the bottom and top layers of your skin.
I have got two: This is my derpy one, and, for my normal one, I can't find the file annymore, but I guess you can say something about it looking at my avatar.