Companies may set different salaries for employees at the same level, performing the same function. This holds true whether or not they are in the same state. The fact is that in an "at will" employment relationshp, an employer may set the terms and conditions of the workplace much as it sees fit. For their part, an employee can choose to work for the employer or not.Exceptions to the above would be if a pay differential is prohibited by terms of an employment contract, union agreement or company policy. Also, such a discrepency must not be due to some for of actionable discrimination.Bottom line, employees do not have to be treated equally, or even fairly for that matter.