Here is my situation, please advise:
Company 1 - EB2 - I-140 Approved - PD : June 2005 - Left the company before filing I-485 on May 2007- I have I-140 approval copy & looks like active still(not revoked)

Joined Company 2 in July 2007 - Processed GC in EB3 -I-140 Approved(using Labor subs) - PD : September 2003 - Filed 485 in August 2007.

Company 3 : Used AC21 to switch from Company 2 - Currently working in here - wages and job responsiblities are matching with EB2.

Can I interfile with my pending I-485 using Company 1's approved I-140 to switch to EB2. In that case , do I require employment letter or anything from Company 1 or just I can send I-140 approval copy along with request letter.

Thanks