Wh stands for color, which means white. The piano is the same.

P 105 is actually an upgraded version of p95, just like iphone 4 and iphone 5.

The functions of p 105 are slightly enhanced, such as supporting accompaniment, which is not available in p95.

There are also different timbre samples, which will be slightly stronger. The piano timbre of p 105 is collected from Yamaha Million Piano CF Series Piano.

Feel it. I've tried both. They're exactly the same.