No one knows for certain, but you should understand how Accutane works.
Accutane, essentially, functions as a slight case of vitamin A poisoning on the body. It elevates Vitamin A levels so high that the body reacts in a certain fashion - namely, it STOPS producing oil. It also has other, randomized effects depending on the person, including potential hair thinning.
I was balding before I took the ol' Isotrenotin, and my loss did not change whatsoever over a 4 month 60mg/daily course. So there's no guarantee.