Well, the descriptions says all. So, let's cut to the chase, shall we? Keep in mind that this is my first ever article, so please be so kind as to not be rude. Also forgive me for not seeing any of the films in a long time.

 First off, I believe that the two are one because I don't think white wolves are very common, even in animations. Now, I'm no wolf expert, that's just what I believe. My belief is based on genetics, and from what I've learned there, the darker the gene, the more likely it will show in an animal or human. Anyway, point is that it is more likely than not ( to me, anyway) that white wolves aren't just found anywhere.

Secondly, I know that we are all familiar with the scene where Balto is hurt and the wolf comes, and the one where a white wolf ( Aniu) appears in Balto 2. I'm just asking, why on earth would some random white wolf come to Balto's aid ( in Balto 1) if the wolf didn't know him? I know that most people would be more willing to help someone they know rather than some total stranger.

 Also, I've heard things about the difference in appearance of Aniu in the two films. Ever heard of mistakes in animation? I mean, maybe the new people didn't like the way she looked, so they scratched that out and drew on some new features.

And finally, people from the actual studio have said that they are the same wolf. How much more proof can you get then that?

 That's all I have to say on the subject. Please comment, but remember to be polite of my views.