In Unity, pay attention to the color of the Sun lamp and match it to what you had in Blender. In Unity the result currently looks tinted towards green. This could also be because of the sky which constitutes to the color as well.
Texture definition is another probable key issue. Depending on how optimal your UV layouts are, you should be getting good results using high resolution textures like 2048 x 2048. In Blender you could bake the textures at 4k or 8k resolution, Unity by default imports images as 2k textures. You can adjust this per texture in the import options, so make sure it's currently not bottlenecking your quality if your textures are otherwise high quality. From the images it's not apparent but make sure to bake normal map and apply the normal map texture to your Unity material. When using a normal map, your model should always be set to smooth shading.