Can we use Approved PERM from previous employer If It's not expired after rejoined the same Employer again

I had a previous employer A who filed my PERM in April 2016 I joined another Employer B in May 2016 in July 2016 previous employer’s PERM was certified and If I will re join to my previous employer A. Can my previous Employer A use my previous certified PERM in order to file I-140?