If they use the newer features (erodible Brushes etc.) then I guess the answer would be: No.
What kind of Brushes did you save in that abr?
Thanks for the info. It is a large group of brushes, maybe I do have some of the newer brushes saved in the group. I will try again with just a few of the brushes.
I have found that the brushes only work in lower versions if they are under 2400px. CC allows us to create larger brushes up to 5000px i believe.
Scan through your brushes and resize any above 2400 and see if that works.