"Ground Turkey" can be made of any part of the turkey; it's basically a mystery whether it's light or dark meat.
"Ground Turkey Breast", which I usually see at a higher price point than the above item, contains white meat. What you've purchased, "Ground Turkey Thighs", would by definition be dark meat.
I have not seen this product locally, but it's very likely the same exact product in your example, because the white meat is sold at a premium so the cheaper stuff is likely dark meat to begin with. I would therefore assume the calories are the same for the time being, and ask the butcher next time you're in. It ought to cook up about the same for most applications, in my experience.
Of course, the fat content is going to make a bigger difference. MyFitnessPal suggests it's a 93/7 grind, just like Butterball; if your package suggests a different ratio, you're probably going to see a difference.