Yes, you and your current employer need to file an I-485J if proceeding based on the approved EB3 petition but whether you will have an issue because of the change in positions will need to be analyzed (although you probably are fine). Does your employer have an immigration attorney because this is something that he or she should analyze?
Yes, my employer does have an immigration attorney. I applied 485 as a Programmer Analyst. But now I work as a Director, Applications with a more diverse application suite than what I originally worked on. The labor and wage and roles/ responsibilities will not create any problems ?
Probably not but I can't advise because I don't have all the paperwork in front of me. The company's immigration attorney should be able to advise.