Oh definitely. I know Buhunds and they are very different to Grønlandshunds. Visually for the first sight (especialy on photo) you may not see difference, but someone who lived long enough with Greenlanders you can tell. If you would see Ulvar in person, you would tell that he is absolutely not even close to Buhund. So yes, I'm certainly sure.
Can't wait to take more pictures of him, maybe by now he is a tad bigger. I enjoy his face so much and also it helps me to improve drawing! Also I would be very curious what kind of *Lupinicious photos would take of him... I'm still trying to plan with him to come on mushing race someday!