The skull on the beach is a little worse for wear, but they are almost unquestionably the same. Look at the holes below the teeth on the lower jaw, the slope of the upper jaw, and the way the two align. You can even see the protuberance in the decaying flesh where the bone above the eye sticks out. It's a Beluga.
Okay. I'm convinced. The sideview of the teeth match. The three little indentations below the front teeth also match. Do whales have hair?