I heard something new these days saying that after the I-140 approval and if you change your employer.
In the new company you can start filling I-485 directly if your PD date comes up without refiling the Labor
and I- 140. Please let me know if any new rule like this has being released these days.
General I-140 
Change of Employer after I -140
Change of Employer after I -140
Change of Employer after I -140
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