What really matters is how they were modeled and if they were modeled to fit with each other or not.

Now I didn't model the helmet or the hands so those files are still at the original scale of the person that did model them. All the other files (the ones I made) are designed to fit together when at the same scale. That being said the scale is something that will have to be determined on a case by case basis because everybody is different and even if you are the same height and weight as the next guy you may have to have a different scale on some pieces to get them to fit correctly.