First, you do not need to worry about 485 pending > or
Second, you do not need to worry about the level of titles, as this is strictly required in Eb1b category.
Upon RFE, if occurs, normally you will be requested an EVL, employment verification letter, when a change of job is suspected. The change of title is not important. I would agree that if you work in the field of double E, usually CIS won't consider a significant change of field.
Well, to avoid any suspicion on the change of field, please keep similar terms as many as possible.