You can use both. They are for totally different conditions that just happen to both be cosmetic. Accutane won't accelerate male pattern baldness to the best of my knowledge. It can lead to some diffuse thinning however.
My biggest recommendation for accutane is to do a low dosage course. It's been proven that the main thing that matters in terms of effectiveness is cumulative dose. Your side effects are far more tolerable at a lower dose and you'll enjoy the same benefits. So, for example, it would be far better to do 20mg once a day for a year than to do 40 mg once a day for six months.