New roborovski color... any idea?

[Robobias]

Hi

I got a gorgeous robo baby couple of days ago and he has a pale color that I have not seen in any of my previous robos. I don't know if the image will show but he has a very light grey/ silvery tone on his back with a darker undercoat. He seems closest to a white husky to me... . Any ideas?
I'll post a comparison pic with my Agouti pied
Thanks