It appears that your BG all have the same adaptation. Based on these pics I think the first pics you posted are similar and they are BG. The last pic is a hybrid of some sort not a pure BG or RES.
I believe it to be one of the bg/res that were stocked.
On the article in the archive where might i find it? I knew I had seen one on here before but couldnt find it so thats why I made this post.
So I guess the large ears are normal on my bg, I have still never seen one with the coloration on its head like the one in the first picture. Guess it is just a little different huh?