I am facing the same situation. my company’s attorney said that I may be elligible for EB2 only if they are able to prove that I have gained progressive experience of 5 years and explain how this experience is going to help me perform my duties in my new role(note that he also suggested a new role as the role at which i joined was not EB2 specific). Keep in mind that for GC both the person AND the job needs to be clearly categorized. For example:- if the job requirement states BS + 3 years of experience, then even if the candidate has say 6 years of experience, the employer will not be able to file his gc in EB2. But say if the requirement is MS + 3 years OR BS + 5 years exp required, then the employer can start the candidate’s GC.
There are lots of if’s and but’s in GC processing and it can be different case to case. I would strongly suggest you to discuss your case with your company’s immigration department and the attorney.