Mine is definitely Asian, Indian, small ears, head shape typical, back flat, instead of a curvature, an several other differences.
Colour can indeed vary from grey to brown as they indeed also like to cover their skin with dried mud, probably to keep insects away. I've choosen my colour from several pics for this first one, grey, but with brown spots (surely after his bath, he! he!!!), but not so brown as Daniel below ..
michel