If it's the Black Cat supp I just found online (with caffeine, cocoa extract, naringin, and other ingredients), it should be fine. Though, I don't really get why that seems to be marketed as an energy supplement when it's basically a straight-up fat burner.
Like Stu said, I don't think there's really anything in the Alpha Male that would "overlap". I've taken Alpha Male with stimulants and fat burners without problems.
If you're at all concerned, take the Alpha Male in the morning and the other stuff before you train (presuming that's a few hours later). Also, you may want to use the general guideline of starting with a lower dose of both (or either) and gradually building up to the max suggested dose over the course of a week or two.