Second picture is a female wolf, hence the narrower head and slighter build, but most assuredly a wolf, probably a younger female as well but not a juvenile I wouldn't guess. I have seen and shot wolves in the Yukon ranging from 70 lb females to 175 lb males, wolves like bears and people come in a lot of different sizes and size is a very poor trait to hang one's opinion on. The second wolf although not as large as the first.....by a stretch.....is still a wolf, but my guess, as I said, would be a younger female. When you have seen enough of these two animals it becomes apparent immediately which is which and there is as many differences in appearance and mannerisms as between whitetail deer and mulies..........those two animals in the photos are wolves, without a hint of doubt for me anyway.