Hi there!
Congratulations on this new promotion. Sounds like by the 'title' you have moved up. I am an alum of a top 5 Global MBA program and here is my advice:
- In this new role, would you be practicing different skill sets? Would this promotion overall make you look well-rounded by having different set of responsibilities than the previous role? If that's the case, then it's a great to show a different side of you on your resume.
- It's your choice HOW you paint the picture of this promotion. With this mindset and attitude, the Ad-coms will take it as that - as face value. They don't know the details. It's what you tell them.
- From the tone of your question, I can sense a tug of war going on in your head. Perhaps, step back and see what the great points are about this promotion? The fact that you have gotten a promotion (to my definition a step up in the ladder, pay increase), is in fact fantastic and does need to be shared to demonstrate the great work you are doing.
- Since it is very near the R2 deadlines as you mentioned there will not be much time for you to deliver value/impact in this new role and then share results in the job essays. The Adcoms will see that you submitted the application in January and the promotion was in October. You can do a few things in here: talk to your referee and let them highlight the great impact you had and that you were promoted here (clearly highlighting that you moved UP the corporate ladder). If the job essays asked to talk about your current role, you can briefly state that you have gotten this promotion and what your mandate it is in this new role. And state that since you have been only for this brief amount of time, you will focus your job essay on the previous role which you were there for a longer time. The goal here is to write stories that will portray the BEST of you and make you look UNIQUE among the pool of competitive candidates.