In a proceeding for compensation on the claim of a covered employee, an employer who is liable for the full extent of the occupational deafness of the covered employee may implead any other employer in whose employment the covered employee was exposed to harmful noise. To implead another employer, the employer shall give to the impleaded employer and to the Commission notice on the form that the Commission requires. If the Commission finds that the impleaded employer would have been liable to the employee had the employee proceeded against the impleaded employer under the claim being adjudicated, the employer liable to the employee is entitled to an award that: is against the impleaded employer; and may be enforced in the same manner as an award in favor of a covered employee. Unless the evidence warrants a different apportionment, the impleaded employer and the employer liable to the covered employee shall have equal liability to the employee.