Not really. People consider factors besides salary when choosing jobs -- location, fringe benefits, work content, prestige, and more -- and there are other constraints on worker/job compatibility. A married person might become a homemaker if it takes too much effort to find a job that is sufficiently attractive; moving to a different city is expensive, especially for someone who expects low earnings; an employer cannot have a workforce that consists entirely of people who are learning to be productive in their jobs; the list goes on.
Most fundamentally, though, the number of available jobs is flexible in a way that defies quantification. If an employer has unmet demand, they could hire more workers if they can find workers at a low enough salary. It might be cheaper for the employer to hire more people who are individually less productive than to hire more-skilled workers. Automation and other forms of labor substitution further complicate the equilibrium. In contrast, the number of people who have applied for unemployment assistance is very easy to measure.