The scene contains five hair & fur objects: mane, tail, ears, cilia and lower leg.
The archive has a folder "Screen_Hair & Fur", in which there are five screens of settings for each H&F object. In all H&F settings, frizz / kink parameters is "0".
The material editor contains three colors of the horse. To replace hair color, you need to take a shader from the matte editor (by name) and insert it into the Hair & Fur / Custom shader by ticking the Apply shader checkbox. Before rendering in Vray, go to the Rendering - Effects tab, click on Hair and Fur and select mr prim mode below. For corona, select geometry there.
“Who works in the V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfaset GTR (GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - which is preferable for you. ” If the version of CORONA is higher than 1.4: “For Corona render, it is recommended to install version no lower than 1.5, as the glossiness of the materials is configured taking into account PBR.”