Retain previous priority date after I-140 approval.

[greencardissue]

I know that it is possible to change Employer's after I-140 approval even if I-485 has not yet been filed (because of retrogression). For that I will have to apply for PERM again with the second Employer, although I will be able to retain the priority date of my I-140 approval with the first Employer.
My question is I have applied for LC through RIR EB-3 (and NOT PERM) with the second employer. Will I be able to retain the priority date of my I-140 approval with the first employer and continue with the second employer and file for I-485 with the priority date of the LC of the first employer?
Please let me know.

 

[creative10]

You will need to file PERM afresh and once that gets approved, you can use your previous priority date to file for 140 and 485.