according to 8 CFR parts 204 and 245:
page 53895
if the physician has found a new employer desiring to petition the Service, the petitioner must submit a new form i-140 (with fee) with all the evidence required in paragrah (c) of this section, including copy of the approval notice of initial I-140. If approved, the new petition will be matched with the pending adjustemt of status application. The beneficiary will retain PD from the initial form I-140.........