Szerintem nem triviális:
https://www.lawfirm4immigrants.com/can-h2b-change-employer/Can H-2B Change Employer?
A common question by most H-2B visa holders is whether they can change employers. This is critical because the validity of the H 2B visa relies on their continued employment with their first employer. As part of the working conditions, nonimmigrant visa holders cannot change employers.