I found from “http://www.immihelp.com/greencard/employmentbasedimmigration/sponsoring-employer.html”
“Person can change the employer under AC21 portability rule if the Adjustment of Status (I-485)application has been pending for more than 6 months and certain conditions are met.
For labor certification based green card, if the employee gets transferred from the original job location outside the normal commuting distance (approximately 35 miles), new labor certification is needed even if the job duties remain the same. For non-labor certification based green card, transfer to different location is fine as long as the job duties remain the same.”
Is this true？
谢谢8老师
