While sales and business development are often used interchangeably, it would be an error for these two very different jobs to be characterized in exactly the same manner. Business Development may also be used as a mask when a sales person does not want to be viewed as a sales person. Some companies will make the sales people feel more important by giving them a special title for their new business cards.
Those who focus primarily on sales and those who work in business development have unique objectives and pathways for accomplishing those objectives. Both business development consultants and salespeople are integral to the growth of a business, but the two roles should complement one another rather than being considered as interchangeable.