Thanks for the tips but i recently got the original skin.
If you want the skin its this
You import it as a usual model.
And, the skin also need an special path.
Units\Creeps\OgreOneHeaded\OgreOneHeaded.blp
Units\Creeps\OgreOneHeadedArmored\OgreLord.blp
The first path overwrites the regular One Headed Ogre (aka Stonemaul Ogre).
The second path overwrites the Armored One Headed Ogre (aka Stonemaul Ogre Lord).
The skin fits with the One Headed Ogre, NOT the Two Headed Ogre.