The body has an advanced shader (looks like one of Bagginsbills) while the one for the head is very basic.  I'd look in the folder where you loaded your texture and see if there is an advanced maerial there for the head.

 

Alternatively, you could note the maps used for the head ( if you click on the bar next to the eye on the Image_map nodes you can click on Image Source and see the file name) Then right-click in the body material window, select Select All and then copy it, and go to the head material window, Select All and paste.  You will them need to change the image maps to those for the head; The top one is the texture and the second one is the bump map...

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