One of my favorite jobs to produce in the Studio is a Headshot. Having one foot in the Business world an one in the Acting world, I want to point out a difference to consider and why they may not be interchangeable.
The commercial headshot is selling a trustworthy product. Perhaps you are an investment banker, realtor, or business CEO. The headshot will portray you and the business to your clients. You may need "that" jacket or certain lapel pin to round out the image.
The theatrical headshot should show more layers of your personality. While you are "selling" yourself, it is important to have an identifiable personality type with some emotional depth. The honesty of the photo is the driving factor and the image may or may not be trustworthy.
Do we need both...perhaps? Choose the right photographer to ask the right questions and settle on the product you need.