The shininess is not unusual. Is it still as flexible as the other one? If so then it's just surface patina from being handled. Brand new from package ones have a smooth surface but aren't really shiny. They pick up the shine from being handled. If it is harder, then someone may have coated it with something like a gloss finish. I wouldn't consider it a problem either way unless it bothers you. If it does try scrubbing it lightly with a toothbrush, that should break down the gloss surface a bit.
_________________
Tim :)
ToyAnimal.info - The Toy Animal Collecting Wiki
Animoblog
Animobil.info Playmobil Animals