Holland was almost 5 months old when I adopted her, and she's just a bitty thing, so there's not much difference... She weighed about 4 pounds when I got her, and is about 7 pounds now, but you can kind of tell the difference between her kitten face and her cat face.
I don't have any kitten pics of my present kitty Autumn since she was over two years old when I adopted her but I do have kitten pics of my Rainbow Angel Misty. Here is her kitten pics, she was about 8 weeks old:
Here she was as an adult:
She was a beautiful and very classy cat, I miss her terribly.